Hello Everyone, I am new to Oracle forms, working on Oracle Applications : 12.1.2, Here I have a form Receiving Transactions, in that I have Lot_Number and quantity columns. The purchased items need to be stored in Lot number. If 100 quantities purchased then 100 quantities can be stored in single lot number i.e Lot_Number Qty 001 100 or 100 quantities can be stored in different lot numbers. i.e Lot_Number Qty 001 50 002 50(The qty may differ) but not like the following, Lot_Number Qty 001 50 001 50. For second line,If they selected same lot number as First lot number, The error message has to be shown as "Lot number duplicated,Select Different Lot number or update the full qty in original line". Can anyone help me to solve this. Thank you. Regards, Gurujothi