'&1' has status 'Released' and is active independent of any customizing.

What causes this issue?

The release status of Feature Toggle &V1& is set to "Released: Feature
is rolled out and active in all systems". Therefore it is active by
default in all systems. Customizing of Feature Toggle &V1& is not
relevant any longer.

System Response

You should also cleanup all code which makes use of the feature toggle
&V1&. Build a "Where-used-list" for the Feature Toggle &V1& and remove
all usages in the code (API of class CL_FEATURE_TOGGLE). Once all
references are deleted you can delete the Feature Toggle itself.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.