No authorization for maintenance planner group & &

What causes this issue?

You are trying to edit an object for which
<GL:maintenance_planner_group>maintenance planner group</> &V1& from
<GL:maintenance_planning_plant>planning plant</> &V2& has been
entered. Your <GL:user_master_record>user master record</> does not
have the necessary entry for this.

System Response

INCLUDE 'KEINE-VERARBEITUNG' OBJECT DOKU ID TX LANGUAGE E

How to fix this error?

You need an entry in your user master record that will allow you to
edit objects of maintenance planner group &V1& from planning
plant &V2&.
INCLUDE 'SYSTEMVERWALTER' OBJECT DOKU ID TX LANGUAGE E

Error message extract from SAP system. Copyright SAP SE.