How To Fix MPE_OAN320 - Relationship of element &1 in OAN &2, version &3 not allowed

MPE_OAN320 - Overview

• Message type: E = Error

• Message class: MPE_OAN - Operation Activity Network Messages

• Message number: 320

• Message text: Relationship of element &1 in OAN &2, version &3 not allowed

What causes this issue?

A relationship was defined that is not allowed.

System Response

The system issues an error for this relationship and will not apply the
changes.

How to fix this error?

Check the following constraints and update the relationships
accordingly. Relationships cannot be created:
-,,In shop floor routings and order-specific shop floor routings that
are non-flexible.
-,,If the target operation activity of an order-specific routing is set
to ?not editable?.
-,,If the target and source are part of the same operation but not part
of the same group.
-,,In cross-operation relationships where the target or source operation
activity is not part of the produce segment.
-,,If the target or source is a group or an event.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

MPE_OAN320 - Details

• The SAP error message MPE_OAN320 typically indicates that there is an issue with the relationship of an element in an Object Assignment Number (OAN) within a specific version. This error often arises in the context of managing object assignments, particularly in the areas of project management, asset management, or similar modules where object relationships are defined.
  
  Cause:
  The error can be caused by several factors, including:
  
  Invalid Relationship Definition: The relationship between the elements defined in the OAN is not valid according to the business rules or configuration settings in the system.
  Versioning Issues: The version specified may not support the relationship being attempted, or the version may be inactive or not properly configured.
  Data Integrity Issues: There may be inconsistencies or missing data in the master data or transactional data that define the relationships.
  Configuration Errors: The configuration settings for object relationships may not be set up correctly in the system.
  
  
  Solution:
  To resolve the MPE_OAN320 error,