Double confirmation in SRM for a PO

Dear Gurus

We had an issue in production where system allowed posting confirmation qty greater than PO qty.In our system it is allowed we have validations in place but might be because of network or other issue system allowed posting confirmation qty greater than PO qty.

When we raised OSS message with SAP, SAP suggested implementing confirmation BADI.But we don’t want to implement a BADI without reproducing the issue

So please let me know how to stop confirmation posting in backend ECC (program or functional module where we can stop posting confirmation in ECC)

Regards

Subhash