This object can only have one profile

What causes this issue?

You can define the ALE Authorizations for a field group for various
objects.
Defing a profile this object is currently not possible. You can only
set and disribute the ALE Authorizations for the whole object. A single
profile is sufficient. Because of this fact it is not possible to
create an further proifile.

System Response

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

How to fix this error?

Cancel the action. If you want to change the profile name, you must
first delete the old profile.

Error message extract from SAP system. Copyright SAP SE.