Final Invoice Indicator Warning message at MIRO

Hi Everyone,

We are looking for a way to warn user while entering Invoice (MIRO) for a PO line which has been marked as "Final Invoice".

I have found messages M8 705 & 707 being helpful, and maintained them as allowed for maintaence through OBA5.

But Still system does not trigger the message if i try to post invoice for a PO line which is marked as "Final Invoice"

Please help if we need to do something different to achieve the results.

Thanks in Advance.

Pankaj B.