Collective bill/installment plan &1 inconsistent

What causes this issue?

The clearing amount &V2& &V4& named on the collective bill/installment
plan is to be split over the relevant individual/original items. The
balance of these individual items however is &V3& &V4&.

System Response

Processing is terminated.

How to fix this error?

Check the document. If the open balance of the individual items does
not correspond to the open amount of the collective bill/installment
plan, then there is a data inconsistency. Otherwise there is a program
error.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.