No User SAP* after the creation of a new client

Hello,

I made a system copy from PROD to DEV-System and upgraded the DEV-System to EHP7. Now I want to create a new customizing client but when I create the client in transaction SCC4 there is no user sap* on this client. I never thought this is possible.

I checked my profile and everythings seems to be fine. (login/no_automatic_user_sapstar = 0)

The client is in the table T000. I searched for any users in this client on SQL but there is no User:

Can you please help me with this issue?

Thanks a lot and regards,

Bernhard