Note: related documents added to selected documents

What causes this issue?

Some documents that did not meet the selection screen document criteria
have been included for processing. This occurs when additional cost
documents exist with the same reference values as a document that was
found using the selection screen document criteria. For correct
processing, all documents with the same reference values must be
reposted.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.