How To Fix MPE_OAN139 - OA &1, version &2 referenced in ref. material assignment &3 &4 is unknown

SAP Error Message - Details

• Message type: E = Error

• Message class: MPE_OAN - Operation Activity Network Messages

• Message number: 139

• Message text: OA &1, version &2 referenced in ref. material assignment &3 &4 is unknown

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.

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message MPE_OAN139 - OA &1, version &2 referenced in ref. material assignment &3 &4 is unknown ?

  The SAP error message MPE_OAN139 typically indicates that there is an issue with the assignment of a reference material in the context of a specific object or transaction. This error can occur in various scenarios, particularly when dealing with materials, production orders, or other related objects in SAP.
  Cause:
  
  Missing Reference Material: The reference material specified in the error message does not exist in the system or is not properly defined.
  Incorrect Version: The version of the reference material may not be valid or may not match the expected version in the system.
  Data Inconsistency: There may be inconsistencies in the data related to the material assignment, such as missing or incorrect master data.
  Authorization Issues: The user may not have the necessary authorizations to access the reference material or its version.
  
  Solution:
  
  Check Material Existence: Verify that the reference material (identified by &3) exists in the system. You can do this by using transaction codes like MM03 (Display Material) to check the material master data.
  Validate Version: Ensure that the version specified (&2) is correct and that it is active. You may need to check the versioning settings for the material.
  Review Material Assignment: Look into the material assignment details to ensure that all required fields are filled out correctly and that there are no missing entries.
  Check Authorizations: Ensure that the user has the necessary authorizations to access the material and its version. This may involve checking user roles and permissions.
  Consult Documentation: If the issue persists, refer to SAP documentation or support notes related to the specific error message for additional troubleshooting steps.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM03 (Display Material), MM02 (Change Material), and OAN1 (Asset Master Record) to navigate and check material details.
  SAP Notes: Search for SAP Notes related to MPE_OAN139 in the SAP Support Portal for any known issues or patches that may address this error.
  Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with SAP experts who can provide further assistance.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.