This forum is to discuss different features/issues of Oracle Financials modules ( GL - General Ledger, AP - Accounts Payable, AR - Accounts Receivable, FA - Fixed Assets & CM - Cash Management ).
Even we had a requirement like this and I have posted it in Oracle Forum and received reply from a person . I think he/she also member in this also. We are working on this. You need to customise your Journal form using triggers. I can share you the info. once we are through with this customization.