Tracking Invoice Document Changes - payment blocks
We are trying to track changes to payment blocks on our system, as we have had several issues & questions. Based on my research, I expected that if an invoice is unblocked manually using transaction code MRBR an entry appears in the invoice change document list (MIR4 >Goto > Display change documents). I expected that this would appear in table CDHDR as an entry with object INCOMINGINVOICE.
Unfortunately, I am not seeing this behavior in our system. However, we can see the changes if we move from viewing the invoice in MIR4 to the associated FI document in FB03, and then select Environment > Document Changes. In this case, I can see the records in table CDHDR as an entry with object BELEG.
There are 3 possibilities that I can think of:
1) The documentation regarding MIR4 and the INCOMINGINVOICE was wrong/old & it no longer works that way.
2) It is a program bug.
3) It is configurable.
Can someone please help explain this to us? We feel like we may be missing some changes that users are making.