Diagnosis
A Site for an R/3 Backend should be created. But a Site for thisBackend does already exist or the Logical System is not maintained inthe desired R/3 Backend client.

Procedure
Maintain the Logical System for the desired client in the R/3 Backendand create the Site again.
If the logical system is already maintained, please refere to theexisting Site that is assigned to the same R/3 Backend.
Note:
One R/3 Backend client is identified uniquely by a Logical System. Forthis reason it's not possible to use the same name for Logical Systemsof different systems or clients.