SttDoc list for doc. &1, posting status &2 only permitted w/o conditions

What causes this issue?

You can only transfer settlement documents to a settlement document list
with conditions after the settlement document list has been posted and
the document has status K, L or N. In this case the document still has
posting status &V2&

System Response

Creation is not possible

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.