How to avoid Duplicate values in Oracle forms

Question

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                100or 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

Answer 1

Hi François Degrelle,
I added the following Plsql in the 'When-validate-Item' block,
declare
l_current_number varchar2(80);
begin     
l_current_number := :lot_entry.lot_number;
first_record;
loop
  if l_current_number = :lot_entry.lot_number then
     message ('Duplicate');
  end if;
  next_record;
end loop;Its started to check from First record itself and giving the message 'Duplicate',
How to check from second record?
when the first record is entered it should not check when the second record is entered it should compare with the First record value and if it is same then it should give message as 'Duplicate'.
Thank you.