Supply chain cost model - supplier selection problem

[Mayur Pustode]

set Supl;

set Manu;

param FC_S {Supl};

param SC_SM {Supl,Manu};

param C_S {Supl};

param D {Manu};

var Q_SM {i in Supl,j in Manu} >=0;

var X {i in Supl} binary;

minimize Total_Cost: sum {i in Supl} (FC_S[i] * X[i]) + sum {i in Supl,j in Manu} (SC_SM[i,j]*Q_SM[i,j]);

                    

                     

                     

subject to capacity {i in Supl} : sum {j in Manu} Q_SM[i,j] <= C_S[i];

subject to demand {j in Manu} : sum {i in Supl} Q_SM[i,j] >= (D[j]);

subject to binary_1 {i in Supl}: sum {j in Manu} Q_SM[i,j] > (((X[i]-1)*999999999));

subject to binary_2 {i in Supl}: sum {j in Manu} Q_SM[i,j] <= ((X[i]*999999999));

Dear sir, please check this model. I am getting my variable x value zero which is binary. please tell me whats the problem with this.  

[ptiwari]

You need to look into your constraints. The solver will set x to zero if it satisfies all constraints. So, you might be missing some constraints.

Thanks,

Paras