How To Fix IX011 - Partner function & can only be used once

IX011 - Overview

• Message type: E = Error

• Message class: IX - Messages for Service Processing

• Message number: 011

• Message text: Partner function & can only be used once

What causes this issue?

The function has been defined in the partner determination procedure
as unique.

System Response

The system will not allow a second entry with this function.

Error message extract from SAP system. Copyright SAP SE.

IX011 - Details

• The SAP error message "IX011 Partner function & can only be used once" typically occurs in the context of partner functions in sales documents, such as sales orders or contracts. This error indicates that a specific partner function (like Sold-to Party, Ship-to Party, etc.) has been assigned more than once in the document, which is not allowed.
  
  Cause:
  
  Duplicate Partner Function Assignment: The most common cause of this error is that the same partner function has been assigned multiple times to a single document. For example, if you try to assign the same Sold-to Party to a sales order more than once, SAP will throw this error.
  
  Configuration Issues: There may be issues in the configuration of partner functions in the system, leading to unexpected behavior.
  Data Entry Errors: Users may inadvertently enter the same partner function multiple times during data entry.
  
  
  Solution:
  
  Check Partner Functions: Review the partner functions assigned to the document. Ensure that