You have locked key &1 &2

What causes this issue?

You have locked object &V1& &V2& yourself, presumably in a different
session.

System Response

The system has rejected your processing step.

How to fix this error?

Release the object.
Lock entries may have been set by mistake. You can delete incorrectly
set entries using transaction SM12 "Select lock entries". Only do this
if you are absolutely sure that the lock entries have been set by
mistake.

Error message extract from SAP system. Copyright SAP SE.