Operating concern & is currently locked. Wait a moment, then try again

What causes this issue?

Operating concern &V1& is currently locked by user &V2&. The user is
either maintaining the operating concern or carrying out a consistency
check.

System Response

The transaction was cancelled.

How to fix this error?

Wait a few minutes and try the transaction again. If this error message
appears again, contact user &V2&.
If this error message occurred during an import (transport), it is
essential that you regenerate the environments for operating concern
&V1& once the transport is complete, even if the environments have the
active status displayed (transaction KEA0)!

Error message extract from SAP system. Copyright SAP SE.