How To Fix MPE_OAN060 - OAN activity element with same external number &1 already exists

MPE_OAN060 - Overview

• Message type: E = Error

• Message class: MPE_OAN - Operation Activity Network Messages

• Message number: 060

• Message text: OAN activity element with same external number &1 already exists

Self-Explanatory Message

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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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Smart SAP Assistant

• What is the cause and solution for SAP error message MPE_OAN060 - OAN activity element with same external number &1 already exists ?

  The SAP error message MPE_OAN060 indicates that there is an attempt to create or modify an Object Accounting (OAN) activity element with an external number that already exists in the system. This typically occurs when you are trying to create a new activity element using an external number that has already been assigned to another activity element.
  
  Cause:
  
  Duplicate External Number: The primary cause of this error is that the external number you are trying to use for the new activity element is already in use by another existing activity element.
  Data Entry Error: There may have been a mistake in data entry, leading to the use of an existing external number.
  System Configuration: In some cases, the system configuration may not allow for duplicate external numbers for activity elements.
  
  
  Solution:
  
  
  Check Existing Activity Elements: 
  
  Use transaction codes like OAN1 (to display activity elements) or OAN2 (to change activity elements) to check if the external number