Conventional invoice verification no longer maintained as of Release 4.6C

What causes this issue?

As described in the Release Notes for 4.6C, conventional invoice
verification is no longer subject to maintenance. Online transactions
for conventional invoice verification have been removed from all menus.
If you use EDI, we would like to call your attention to the
improvements that have been made.

System Response

IDoc document processing is terminated. No invoice documents are
created.

How to fix this error?

Reset your Customizing to logistics invoice verification by changing
the process code from INVM to INVL. You can find more details in our
online documentation in the Basis Services/Communication section
(BC-SRV) under IDoc Interface: EDI Application Scenarios (BC-SRV-EDI).

Error message extract from SAP system. Copyright SAP SE.