How To Fix CMD_API051 - Customer &1: Contact person with partner number &2 already exists

CMD_API051 - Overview

• Message type: E = Error

• Message class: CMD_API - Customer APIs

• Message number: 051

• Message text: Customer &1: Contact person with partner number &2 already exists

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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CMD_API051 - Details

• The SAP error message CMD_API051 indicates that there is an attempt to create or modify a contact person for a customer, but the contact person with the specified partner number already exists in the system. This error typically arises in the context of customer master data management.
  
  Cause:
  The error occurs due to the following reasons:
  
  Duplicate Entry: The contact person you are trying to add already exists in the system with the same partner number.
  Data Entry Error: There may have been a mistake in entering the partner number or customer details, leading to an attempt to create a duplicate record.
  Data Migration Issues: If data was migrated from another system, duplicates may have been created inadvertently.
  
  
  Solution:
  To resolve the CMD_API051 error, you can take the following steps:
  
  
  Check Existing Records:
  
  Use transaction codes like BP (Business Partner) or XD03 (Display Customer) to search for the existing contact person using the partner number.
  Verify if the contact person