SAP Message R3221 - The basic IDoc type & is already available

Diagnosis
An IDoc of type &V1& already exists in the source system and cannot becreated a second time.

Procedure
The names of the IDoc types are generated automatically by the BusinessInformation Warehouse, and are based on the name prefixes from thetable RSADMIN.
You can resolve this naming conflict by changing the prefix in thistable under the key RSAC_IDOCTYPE_PREFIX.