How To Fix IS019 - The partner function entered is not unique

IS019 - Overview

• Message type: E = Error

• Message class: IS - Equipment management

• Message number: 019

• Message text: The partner function entered is not unique

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

You establish the definitions of partner functions in Partner
Determination in Customizing.
<DS:TRAN.VOP2>Maintain Partner Determination</>

Error message extract from SAP system. Copyright SAP SE.

IS019 - Details

• The SAP error message IS019, which states "The partner function entered is not unique," typically occurs in the context of partner determination in various SAP modules, such as Sales and Distribution (SD) or Materials Management (MM). This error indicates that the system has found multiple entries for the specified partner function, which leads to ambiguity in processing.
  
  Cause:
  
  
  Duplicate Partner Functions: The most common cause of this error is that there are multiple partner records defined for the same partner function in the system. For example, if you have multiple customers or vendors assigned to the same partner function (like Sold-to Party, Ship-to Party, etc.), the system cannot determine which one to use.
  
  
  Incorrect Configuration: The partner determination procedure may not be set up correctly, leading to conflicts in partner assignments.
  
  
  Data Entry Errors: Sometimes, the error can arise from incorrect data entry, where the user inadvertently selects or enters a partner function that