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

Hi all,

     I've got two SAP PI systems, QA and PROD.

     I've got also two sld environments, one for QA and the other one for PROD. I have done a copy fro QA to PROD.

     Now I want to deploy (via file) my integration scenarios from QA to PROD. I have defined transport groups in SLD PROD, but when I do the import of the file I've got this error:

Obligatory transport target for business system <SYSTEM>|<CHANNEL> not found in System Landscape Directory

I have seen several post about this topic, but no one help me.

Any Idea?

Regards.