SAP System has status 'not modifiable' when running SPDD

Hi...

I missed to change my client 000 to modifiable before the upgrade.

Now when trying to run SPDD I get the error "SAP System has status 'not modifiable' "

It is not possible to change from SCC4 in the shadow instance, errormessage, " Entry TST000 does not

exist in TBDLS "

If I change in the original instance, the change does not fix the problem

in our shadow instance.

Is there a way to solve this, or do I have to start from the beginning?

Thanks in advance.

Carl