Debit/credit indicator is inconsistent

What causes this issue?

The debit/credit indicator "&v2&" was transferred to item "&v1&" of the
FI/CO document. However, a debit/credit indicator of "&v4&" was derived
because of posting key "&v3&".
The transferred posting key and transferred debit/credit indicator are
inconsistent.

System Response

Inconsistent data cannot be processed.

How to fix this error?

An error has occurred in the active application. Either the
debit/credit indicator must be consistent with the posting key when
transferred, or the called application will refuse the transfer of the
debit/credit indicator and use the FI-Service to derive it.

Error message extract from SAP system. Copyright SAP SE.