Requirements grouping: Function not possible after goods receipt

What causes this issue?

You have already posted a goods receipt for the production order and
you now want to change the account assignment WBS element.

System Response

The system cannot execute the function.

How to fix this error?

Check your entries and, if necessary, cancel the goods receipt.

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.