You cannot cancel inspection lot &1

What causes this issue?

You tried to cancel the material document with which the inspection lot
&V1& was created. The system therefore tries to cancel the inspection
lot as well, or mark the lot for cancellation. It cannot, however,
carry out this function at the present time.

System Response

The inspection lot is not canceled, or marked for cancellation.

How to fix this error?

Check the status of the inspection lot and cancel the lot manually if
necessary.

Error message extract from SAP system. Copyright SAP SE.