Diagnosis
You tried to create architectural object &V1&. This number is alreadyassigned in the system.

System Response
The number is invalid.
Possible reasons:
This architectural object type is defined as the toplevel in the hierarchy in Customizing.
Global numbering was defined for thearchitectural object type in Customizing.
In both of these cases, the number entered for the architectural objecthas to be unique in the whole client.

Procedure
Use a different number.