3409972 - OPS7 | Client XXX has status 'not modifiable' | Client role Production

You try to maintain data of transaction OPS7 in a client with client role Production. 

or 

You try to execute IMG activity Specify Applicants for WBS elements in SAP Reference IMG

Client XXX has status 'not modifiable' appears in a client with client role Production 
Example:

After confirmation customizing data appears in display mode.

Message no. TK430

Diagnosis

The system administrator has set your logon client to the 'not modifiable' status.

Client-specific objects can not be changed in this client.

System Response

The function terminates.

Procedure

Contact the system administrator.
For more information, see the SAP Library under Change and Transport System.

This KBA applies to all SAP Products based on NetWeaver and S4H.

Laufende Einstellung, Produktion, Client has status 'not modifiable', Mandant &1 hat den Status "nicht änderbar", Message No. TK430, TK 430, Message no. TK729, TK 729, Rolle des Mandanten Produktion, editable, editierbar, nicht änderbar, Antragsteller für PSP-Elemente anlegen , KBA , BC-CUS-TOL-TME , View Maintenance Tool , PS-ST , Structures , Problem