Enhancement set &1 contains component enhancements and cannot be deleted

What causes this issue?

Enhancement set &VAR1& still contains component enhancements.

System Response

The deletion of the enhancement set was terminated.

How to fix this error?

Delete all component enhancements and then try to delete the enhancement
set again. If required, use view cluster BSPWDVC_CMP_EXT to identify
which component enhancements still exist.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.