Variable validate on the receipt form

100pudoff

Hi, Navision masters! I have a simple question..
I have a form for barcode scanner input. It consists of 2 part "Whse. Receipt Header" form and "Whse. Receipt Line" subfom. I want to locate BinCode field on the main form. BinCode field = BinVf CODE20 variable. It's "Bin Code" field in "Whse. Receipt Line" record. How can I validate this field? Validation field trigger operators of this record TESTFIELD, FIELDERROR etc. are results to form closing.. I don't wish to copy record field validation trigger to the form variable validation trigger. It's bulky decision on my mind.. Is there are decisions better?