Add this to the form's frmOpenEvent

    FieldType *yourfield;
    FieldAttrType attr1;

    yourfield = (FieldType *)FrmGetObjectPtr(FrmGetActiveForm(), 
FrmGetObjectIndex(FrmGetActiveForm(), yourfield'sname));

    FldGetAttributes(yourfield,&attr1);
    attr1.numeric = 1;
    FldSetAttributes(yourfield,&attr1);

That allows only numerical values to be inserted (including decimal and 
negative numbers). Other characters won't be allowed
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