Service entry sheet saved, acceptance document & posted

What causes this issue?

You have saved the service entry sheet after having carried out or
revoking an acceptance. Acceptance document &V1& has been created as a
result.
The acceptance document for service entry sheets is a goods receipt
(GR) document. You can display the GR document via the purchase order
history.

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?

Error message extract from SAP system. Copyright SAP SE.