How To Fix AP304 - Partner function not specified as unique.

AP304 - Overview

• Message type: E = Error

• Message class: AP - Investment program messages

• Message number: 304

• Message text: Partner function not specified as unique.

What causes this issue?

You selected a characteristic for the partner function, but you did not
enter a defined partner function. When you select this characteristic,
you must always enter a specific partner function that was defined in
Customizing.

System Response

The report is not executed.

How to fix this error?

Check your entries and the report definition.
You should also note: the characteristic for the partner function can
only be used along with the characteristic for the partner.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AP304 - Partner function not specified as unique. ?

  The SAP error message AP304 ("Partner function not specified as unique") typically occurs in the context of partner determination in SAP, particularly when dealing with business partners in sales and distribution (SD), materials management (MM), or other modules that utilize partner functions.
  
  Cause:
  The error indicates that the system is unable to determine a unique partner function for a specific business partner in the context of the transaction you are trying to execute. This can happen for several reasons:
  
  Multiple Entries: There are multiple entries for the same partner function in the partner determination procedure, leading to ambiguity.
  
  Configuration Issues: The partner determination procedure may not be configured correctly, or the partner function may not be set up as unique in the configuration.
  Missing Data: The required partner function may not be assigned to the business partner or may be missing in the relevant master data.
  Incorrect Partner Role: The partner role assigned to the business