3017709 - Possible Duplicate exception is not appearing in an invoice

The Possible Duplication exception/error is not appearing though all the criteria you have set is matched.

SAP Business ByDesign

Default criteria : Same Supplier ID, External document ID matched 80% or above and Invoice date + or - 7 days.

Additional criteria :What  you set in BC activity "Supplier invoice exception "

In general ,

System will check and need all Default criteria to match between both invoices to raise exception

When all or one of the elements in default criteria does not match then only system will check for additional criteria, other wise it will not check for them.

System will check and need all additional criteria to match between both invoices to raise exception

Also, system will check for one more criteria that is PO reference, only when additional criteria is set up and used by system. If both POs are same then error is raised.

So in your case one of the default criteria

or  one of additional criteria is not matched

or PO reference is not there in one of the invoice

or PO reference is not matched

Thus no error is appearing.

  3194471 - Possible Duplicate of Supplier Invoice is not detected

3238150 - System Failed to Show the Duplicate Exception When External Document ID Contains Apostrophe.

Possible Duplicate error, no exception, supplier invoice duplicate , KBA , exception , SRD-SRM-SI , Supplier Invoicing , Problem