Hello,
thanks for your help.
Now I changed my model to this:
####VSCM###
###SETS###
set DAYS;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
set SHIFTS;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
set TOURS;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
set QUALIFICATIONS;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
set GROUPS {QUALIFICATIONS};Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
set EMPLOYEES = union {k in QUALIFICATIONS} GROUPS[k];Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
###PARAMETERS###
param a {DAYS,SHIFTS,QUALIFICATIONS,TOURS}; Â Â Â Â Â
param c {TOURS, EMPLOYEES} binary;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
param d {DAYS,SHIFTS,QUALIFICATIONS};Â Â Â Â Â Â Â Â Â Â Â
param e {TOURS,k in QUALIFICATIONS, GROUPS[k]};
param TOL;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
###VARIABLES###
var x {l in TOURS} binary;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
var u {DAYS,SHIFTS,QUALIFICATIONS} >= 0;
var y {k in QUALIFICATIONS, GROUPS[k]} >= 0;Â Â Â Â Â
var z {k in QUALIFICATIONS, GROUPS[k]} >= 0;Â Â Â Â Â
###ZIELFUNKTION###
minimize UNDERSTAFFING: sum {i in DAYS, j in SHIFTS, k in QUALIFICATIONS} u[i,j,k];
###CONSTRAINTS###
Â
 subject to Set_Covering {i in DAYS, j in SHIFTS, k in QUALIFICATIONS}: u[i,j,k] + sum {l in TOURS} a[i,j,k,l] * x[l] >= d[i,j,k];
Â
 subject to Tour_Selection {m in EMPLOYEES}: sum{l in TOURS} c[l,m] * x[l] = 1;
Â
 subject to max_Fairness {k in QUALIFICATIONS, g in GROUPS[k]}: sum {l in TOURS} e[l,g,k]*x[l] <= y[g,k];
Â
 subject to min_Fairness {k in QUALIFICATIONS, g in GROUPS[k]}: sum {l in TOURS} e[l,g,k]*x[l] >= z[g,k];
Â
 subject to Tolerance {k in QUALIFICATIONS, g in GROUPS[k]}: y[g,k] - z[g,k] <= TOL;
Now I am having trouble with defining the data. How do I define param e right?
DATA:
###SETS###
set DAYS   :=   Mo   Di   Mi   Do   Fr   Sa   So   ;                                                           Â
set SHIFTSÂ Â Â :=Â Â Â FÂ Â Â SÂ Â Â NÂ Â Â ;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
set QUALIFICATIONSÂ Â Â :=Â Â Â KOMÂ Â Â STAÂ Â Â VORÂ Â Â ;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
set TOURSÂ Â Â :=Â Â Â 1Â Â Â 3Â Â Â 5Â Â Â 12Â Â Â 14Â Â Â 16Â Â Â 23Â Â Â 25Â Â Â 27Â Â Â 34Â Â Â 36Â Â Â 38Â Â Â 45Â Â Â 47Â Â Â 49Â Â Â 56Â Â Â 58Â Â Â 60Â Â Â 67Â Â Â 69Â Â Â 71Â Â Â 78Â Â Â 80Â Â Â 82Â Â Â 89Â Â Â 91Â Â Â 93Â Â Â ;Â Â Â Â
#set EMPLOYEESÂ Â Â :=Â Â Â 1Â Â Â 2Â Â Â 3Â Â Â 4Â Â Â 5Â Â Â 6Â Â Â 7Â Â Â 8Â Â Â 9Â Â Â 10Â Â Â 11Â Â Â 12Â Â Â 13Â Â Â 14Â Â Â 15Â Â Â 16Â Â Â 17Â Â Â 18Â Â Â 19Â Â Â 20Â Â Â 21Â Â Â 22Â Â Â 23Â Â Â 24Â Â Â 25Â Â Â 26Â Â Â 27Â Â Â ;
set GROUPS [KOM]Â Â Â :=Â Â Â 1Â Â Â 2Â Â Â 3Â Â Â 4Â Â Â 5Â Â Â 6Â Â Â 7Â Â Â 8Â Â Â 9Â Â Â ;
set GROUPS [STA]Â Â Â :=Â Â Â 10Â Â Â 11Â Â Â 12Â Â Â 13Â Â Â 14Â Â Â 15Â Â Â 16Â Â Â 17Â Â Â 18Â Â Â ;
set GROUPS [VOR]Â Â Â :=Â Â Â 19Â Â Â 20Â Â Â 21Â Â Â 22Â Â Â 23Â Â Â 24Â Â Â 25Â Â Â 26Â Â Â 27Â Â Â ;
#param EMPLOYEENR:= 27;
###PARAMETERS###
param a:=Â Â Â [*,*,*,:]:Â Â Â Â Â Â 1Â Â Â 3Â Â Â 5Â Â Â 12Â Â Â 14Â Â Â 16Â Â Â 23Â Â Â 25Â Â Â 27Â Â Â 34Â Â Â 36Â Â Â 38Â Â Â 45Â Â Â 47Â Â Â 49Â Â Â 56Â Â Â 58Â Â Â 60Â Â Â 67Â Â Â 69Â Â Â 71Â Â Â 78Â Â Â 80Â Â Â 82Â Â Â 89Â Â Â 91Â Â Â 93Â Â Â :=
            Mo   F   KOM   1   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Di   F   KOM   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mi   F   KOM   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Do   F   KOM   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Fr   F   KOM   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Sa   F   KOM   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            So   F   KOM   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mo   S   KOM   0   0   0   1   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Di   S   KOM   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mi   S   KOM   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Do   S   KOM   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Fr   S   KOM   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Sa   S   KOM   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            So   S   KOM   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mo   N   KOM   0   0   0   0   0   0   1   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Di   N   KOM   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mi   N   KOM   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Do   N   KOM   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Fr   N   KOM   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Sa   N   KOM   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            So   N   KOM   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mo   F   VOR   0   0   0   0   0   0   0   0   0   1   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Di   F   VOR   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mi   F   VOR   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Do   F   VOR   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Fr   F   VOR   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Sa   F   VOR   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            So   F   VOR   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mo   S   VOR   0   0   0   0   0   0   0   0   0   0   0   0   1   1   1   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Di   S   VOR   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mi   S   VOR   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Do   S   VOR   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Fr   S   VOR   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Sa   S   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0  Â
            So   S   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0   0   0  Â
            Mo   N   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   1   0   0   0   0   0   0   0   0   0  Â
            Di   N   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0  Â
            Mi   N   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0   0   0   0  Â
            Do   N   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0  Â
            Fr   N   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0   0  Â
            Sa   N   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0  Â
            So   N   VOR   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0   0   0  Â
            Mo   F   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   1   0   0   0   0   0   0  Â
            Di   F   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0  Â
            Mi   F   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0   0   0   0  Â
            Do   F   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0  Â
            Fr   F   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0   0  Â
            Sa   F   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0  Â
            So   F   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0   0   0  Â
            Mo   S   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   1   0   0   0  Â
            Di   S   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0  Â
            Mi   S   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1   0   0   0  Â
            Do   S   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0  Â
            Fr   S   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0   0  Â
            Sa   S   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0  Â
            So   S   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0   0   0  Â
            Mo   N   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   1  Â
            Di   N   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1  Â
            Mi   N   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   1  Â
            Do   N   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0  Â
            Fr   N   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   0  Â
            Sa   N   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1  Â
            So   N   STA   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   1   ;
           Â
param c   :=   [:,*]   :   1   3   5   12   14   16   23   25   27   34   36   38   45   47   49   56   58   60   67   69   71   78   80   82   89   91   93   :=                                                                                                                                                                                                                    Â
               1   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               2   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               3   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               4   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               5   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               6   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               7   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               8   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               9   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               10   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               11   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               12   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               13   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               14   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               15   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               16   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               17   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               18   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               19   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               20   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               21   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0   0                                                                                                                                                                                                                       Â
               22   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0                                                                                                                                                                                                                       Â
               23   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0   0                                                                                                                                                                                                                       Â
               24   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0   0                                                                                                                                                                                                                       Â
               25   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0   0                                                                                                                                                                                                                       Â
               26   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   0                                                                                                                                                                                                                       Â
               27   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   1   ;
              Â
param d   :=   [*,*,:]:   KOM   STA   VOR   :=                                                                                                                                                                                                                                                                                                    Â
         Mo      F   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Mo      S   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Mo      N   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Di      F   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Di      S   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Di      N   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Mi      F   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Mi      S   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Mi      N   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Do      F   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Do      S   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Do      N   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Fr      F   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Fr      S   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Fr      N   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Sa      F   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Sa      S   10   5   2                                                                                                                                                                                                                                                                                                  Â
         Sa      N   10   5   2                                                                                                                                                                                                                                                                                                  Â
         So      F   10   5   2                                                                                                                                                                                                                                                                                                  Â
         So      S   10   5   2                                                                                                                                                                                                                                                                                                  Â
         So      N   10   5   2   ;
        Â
param e   :=   [:,*,*]   :   1   3   5   12   14   16   23   25   27   34   36   38   45   47   49   56   58   60   67   69   71   78   80   82   89   91   93   :=
            KOM   KOM   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1  Â
            STA   STA   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1  Â
            VOR   VOR   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   1   ;
                                                                                                                                                                                                                    Â
param TOLÂ Â Â :=Â Â Â 100Â Â Â ;Â
Thank you for your help.
Sabine      Â