How To Fix MPE_OAN090 - Characteristics assignment &1 &2 already exists in OA &3, version &4

SAP Error Message - Details

• Message type: E = Error

• Message class: MPE_OAN - Operation Activity Network Messages

• Message number: 090

• Message text: Characteristics assignment &1 &2 already exists in OA &3, version &4

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MPE_OAN090 - Characteristics assignment &1 &2 already exists in OA &3, version &4 ?

  The SAP error message MPE_OAN090 indicates that there is an attempt to assign a characteristic to an object (in this case, an object assignment) that already has that characteristic assigned. This typically occurs in the context of Object Management in SAP, particularly when dealing with characteristics in the Object Attributes (OA) of a material or a similar entity.
  Cause:
  The error is triggered when:
  
  You are trying to assign a characteristic (e.g., a property or attribute) to an object (like a material or equipment) that already has that characteristic assigned in the specified version of the object attributes.
  There may be a duplicate entry in the assignment process, or the characteristic is being added again without being removed first.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Assignments:
  
  Navigate to the Object Attributes (OA) for the specific object (e.g., material, equipment) and check the list of assigned characteristics.
  Verify if the characteristic you are trying to assign is already present.
  
  
  
  Remove Duplicate Assignment:
  
  If the characteristic is already assigned and you need to change it, you may need to remove the existing assignment before adding a new one.
  Use the appropriate transaction code (like CT04 for characteristics) to manage the assignments.
  
  
  
  Review Versioning:
  
  Ensure that you are working with the correct version of the object attributes. If the object has multiple versions, make sure you are not trying to assign the characteristic to a version where it already exists.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources related to Object Management and characteristics to ensure you are following the correct procedures.
  
  
  
  Check for Custom Logic:
  
  If there are custom enhancements or logic in your SAP system that might affect characteristic assignments, consult with your SAP technical team to investigate any potential issues.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CT04 (to create/change characteristics), OAC0 (to manage object attributes), and OAN1 (to manage object assignments).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Authorization: Ensure that you have the necessary authorizations to make changes to object attributes and characteristics.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it. If the issue persists, consider reaching out to your SAP support team for further assistance.