Catalog is locked by &1, retry after &1 has finished

What causes this issue?

Enhancement &V2& is already locked by &V1&.
Each enhancement has a catalog that lists all objects that are to be
generated.

System Response

The generation of enhancement &V2& failed.

How to fix this error?

Wait for &V1& to finish their work and regenerate the enhancement.

Procedure for System Administrators

Enqueue process: &V3&
Catalog or element ID: &V4&

Error message extract from SAP system. Copyright SAP SE.