SLD target for backtransport

Hello,

In our landscape we have four PI systems and three ABAP systems.

While we have the traditional Dev, QA and Prod boxes for both systems, for PI we also have a sandbox system.

In the SLD the ABAP system is configured as a business system with transport targets for Dev -> QA -> Prod.

Now I would like to copy all config from Dev to the Sandbox, but during Import I am getting:

"Obligatory transport target for business system ERP_DEV not found in System Landscape Directory".

What I would actually like to do is to keep ERP_DEV in all transported Config items, as we want to connect to the ERP_DEV from the Sandbox PI system as well.

I have tried to add the ERP_DEV also into the Sandbox group in SLD in order to define it as a transport target for itself when transporting from Dev to Sandbox, but this doesn't work as I cannot re-use the technical system: "The selected client already has a business system associated. Select a different client or system."

Therefore my question is:

What needs to be done in SLD so that when importing from Dev to Sandbox no translation of the Business System ERP_DEV is being performed and so that I can import all my config objects?

Hope that someone can help me out here.