Inspection lot &2 is being processed by &1

What causes this issue?

Inspection lot &v2& is currently being processed.

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?

Select another inspection lot number or wait until processing of order
&v2& has been completed.

Error message extract from SAP system. Copyright SAP SE.