Function only makes sense in the case of supplier bus. vol. recompilation

What causes this issue?

The function <LS>Compare documents</> generates a list output showing
all already updated documents on the left and the documents determined
during the program run on the right.
The purpose of this function is to provide a simple check as to whether
all documents have been processed during a recompilation of the supplier
business volume figures pertaining to a volume rebate arrangement. If a
difference should arise here, it can normally be assumed that a program
error has occurred.
Comparison between the two columns will automatically reveal differences
in the following cases (i.e. no program bug in these cases):

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

You have not carried out the recompilation of the supplier business
volume for rebate arrangement &V1& but have only processed supplementary
supplier business volumes.
You have only carried out a check run. At the same time, supplementary
supplier business volumes exist. The retrospective updating in respect
of the documents determined has not been carried out due to the check
run. This also applies to the recompilation, since here supplementary
supplier business volumes are automatically included in the processing.

How to fix this error?

It may be necessary to have the updating carried out before it makes
sense to invoke this function.

Error message extract from SAP system. Copyright SAP SE.