Message type: E = Error
Message class:  BCOM_R_BPARTNERGROUP - Business Communication: Messages for Rule-Based Routing 
Message number: 064
Message text: Group already exists on server: Is the address type already known?
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The SAP error message BCOM_R_BPARTNERGROUP064 indicates that there is an attempt to create a business partner group that already exists on the server. This error typically arises in the context of Business Partner (BP) management within SAP, particularly when dealing with the creation or modification of business partner groups.
Cause: Duplicate Entry: The most common cause of this error is that the business partner group you are trying to create already exists in the system. Address Type Conflict: The error message suggests that there may be an issue with the address type being used, indicating that the system is trying to associate an address type that is already known or defined.
Solution: Check Existing Groups: Before creating a new business partner group, check the existing groups in the system to see if the group you are trying to create already exists. You can do this by navigating to the relevant transaction (e.g., BP transaction) and
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