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

MPE_OAN139 - Overview

• 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

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MPE_OAN139 - Details

• 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