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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