All serial numbers have been entered

What causes this issue?

You are trying to enter further <GL:serial_number>serial numbers</>.
All the necessary serial numbers have already been entered.

System Response

INCLUDE 'KEINE-VERARBEITUNG' OBJECT DOKU ID TX LANGUAGE E

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.

Error message extract from SAP system. Copyright SAP SE.