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
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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
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