Detach ERP from CRM after copy

Hi experts,

One of our customers has a 3-level-system architecture (P, Q, D) for ERP and a 2-level-system architecture for CRM(P and D)

ERP P --> CRM P

ERP Q --> -

ERP D --> CRM D

The ERP Q is not attached to any CRM System.

Now we have done the system copy from ERP P to ERP Q. The RFC-Destination has been deleted accordingly, to prevent ERP Q to send data to CRM P.

But how can we completely detach the ERP Q from CRM P?

My preferred procedure would be:

1. Run report mentioned in Note 564435 and do all manual steps (Except TX BDLS)
2. Delete CRM P logical system in BD54

Do i miss something out?

Thanks in advance!

Wladimir