Message type: E = Error
Message class:  OIJ_RU - Messages for TSW-ETRAN integration 
Message number: 012
Message text: Partner with external partner ID & already exists; check your entry
You have entered the same external partner ID for different partners in
the same partner object (customer, vendor, plant, or storage location).
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message OIJ_RU012 indicates that there is an issue with the partner data in the system. Specifically, it means that a partner with the specified external partner ID already exists in the system, and therefore, the system is preventing the creation of a duplicate entry.
Cause: Duplicate Entry: The most common cause of this error is that the external partner ID you are trying to enter already exists in the system. This could happen if the partner was previously created or imported. Data Entry Error: There may be a typographical error in the external partner ID you are trying to enter, leading to confusion with existing entries. Data Synchronization Issues: If your system is integrated with other systems (like CRM or third-party applications), there may be synchronization issues leading to duplicate entries.
Solution: Check Existing Partners: Use the transaction code or relevant menu path to search for existing partners using the external partner ID
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