Reference user &2: No authorization for group &1 for role &3, system &4

What causes this issue?

Reference user &V2& has the role assignment &V3& for system &V4&. You
are not authorized to change this role assignment for users in user
group &V1&.


Background
By entering a reference user for a user, the user is granted the
authorizations of the reference user. These authorizations are withdrawn
from the user when you remove this reference user.
The system checks whether the user administrator is allowed to manually
enter and remove these authorizations using role and profile
assignments. If the check fails, the assignment of the reference user
cannot be changed.

System Response

The reference user's assignment was not changed.

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.