First delete all dependent components and exceptions to &1, &2

What causes this issue?

You want to delete an object-parameter assignment with context parameter
<(>&<)>1 and value assignment type <(>&<)>2. However, this assignment is
currently used in the Customizing activity "Specify Context-Specific
Components and Exception Values".

System Response

The system does not allow you to delete object-parameter assignments
that are still used in Customizing activities "Specify Context-Specific
Component Types" or "Specify Context-Specific Exception Values".

How to fix this error?

Check whether component types or exception values are assigned to the
selected objects. If necessary, delete these first in the Customizing
activities mentioned above.

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.