Document splitting: Items for clearing &1/&2/&3/&4 not found

What causes this issue?

Document splitting cannot perform clearing because it was not possible
to find complete splitting information on the items to be cleared
(company code, document number, fiscal year, item).

System Response

Clearing cannot be performed and the document cannot be posted.

How to fix this error?

Exclude the affected item from clearing.
It may be that this item was not posted with active document splitting.
In this case, this item or document would have to be migrated.

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.