Debit / Credit

Hi

I am having a very silly problem with the G/L Accounts opening balance which my client is asking for. The current screen in SAP shows only one column for entry of opening balance, and based on if the balance is debit or credit the appropriate sign is to be assigned to it. But my client wants to have two seperate columns exclusively to define the opening balance as debit or credit.

even the form settings are not available for that form.

Can I use User field for the same, write a query and formatted search for OB column to update as per the sign for the entry in UDF?

Thanks in advance

Rohan