How To Fix UD418 - Assigning & to & would result in a cycle, so not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: UD - EDM - Enterprise Data Model

• Message number: 418

• Message text: Assigning & to & would result in a cycle, so not possible

What causes this issue?

You tried to assign data model &V2& to data model &V1&. However, &V1&
already contains data model &V2&. Consequently, this assignment would
result in a recursion that is semantically incorrect and thus not
allowed.

System Response

The operation is not performed.

How to fix this error?

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message UD418 - Assigning & to & would result in a cycle, so not possible ?

  The SAP error message UD418, which states "Assigning & to & would result in a cycle, so not possible," typically occurs in the context of assignments in SAP, such as when dealing with organizational units, cost centers, or other hierarchical structures. This error indicates that the system has detected a potential circular reference in the assignment you are trying to make.
  Cause:
  The error arises when you attempt to assign an object (like a cost center, profit center, or organizational unit) to another object in a way that would create a loop or cycle. For example, if you try to assign Cost Center A to Cost Center B, and Cost Center B is already assigned to Cost Center A, this would create a cycle, which is not allowed in SAP.
  Solution:
  To resolve this error, you should:
  
  
  Review Assignments: Check the current assignments of the objects involved. Ensure that the assignment you are trying to make does not create a circular reference.
  
  
  Modify Assignments: If you find that the assignment would indeed create a cycle, you will need to modify the existing assignments to eliminate the cycle. This may involve reassigning one of the objects to a different parent or removing the assignment altogether.
  
  
  Use Transaction Codes: Depending on the context, you may need to use specific transaction codes to view and modify the assignments. For example:
  
  For cost centers, you might use transaction code KS01 (Create Cost Center) or KS02 (Change Cost Center).
  For organizational units, you might use PPOME (Change Organizational Structure).
  
  
  
  Consult Documentation: If you are unsure about the structure or the relationships between the objects, refer to the relevant SAP documentation or consult with a colleague who has experience with the specific module you are working with.
  
  
  Testing: After making changes, test the assignment again to ensure that the error no longer occurs.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or known issues related to this error message.
  System Configuration: Ensure that your system configuration allows for the intended hierarchy and that there are no restrictions that could lead to this error.
  User Authorization: Make sure you have the necessary authorizations to make changes to the assignments in question.
  
  By following these steps, you should be able to identify the cause of the UD418 error and implement a solution to resolve it.