Suponiendo que el EditBox se llama "Edit1"
lcValor=ALLTRIM(thisform.Edit1.Value)
lcEnter=CHR(13)+CHR(10)
IF RIGHT(lcValor,2)=lcEnter
MESSAGEBOX("Tiene un Enter al Final")
nLen=LEN(lcValor)
thisform.Edit1.Value=SUBSTR(lcValor,1,nLen-2)
ELSE
MESSAGEBOX("No tiene Enter al Final. Ultimo Caracter: "+LTRIM(STR(ASC(RIGHT(lcValor,1)))))
ENDIF