How To Fix RESCSU066 - SU &1 is for directly assigned costs - SU &3 already exists for RO &2

SAP Error Message - Details

• Message type: E = Error

• Message class: RESCSU - Error Texts for Settlement Unit

• Message number: 066

• Message text: SU &1 is for directly assigned costs - SU &3 already exists for RO &2

What causes this issue?

Settlement unit &v1& was assigned to a service charge key in which the
indicator for directly assigned costs is set.
Rental object &v2&, however, is also assigned to settlement unit &v3& in
period &v4&. Settlement unit &v3& has the same service charge key as
settlement unit &v1&.
Double assignment is not allowed.

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

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RESCSU066 - SU &1 is for directly assigned costs - SU &3 already exists for RO &2 ?

  The SAP error message RESCSU066 indicates that there is an issue with the assignment of costs in the system. Specifically, it suggests that you are trying to assign a cost element (SU &1) that is meant for directly assigned costs, but there is already an existing assignment (SU &3) for the same cost object (RO &2). 
  Cause:
  
  Duplicate Assignment: The error typically arises when there is an attempt to assign a cost element that is already assigned to a cost object. This can happen if the same cost element is being used for multiple assignments or if there is a misconfiguration in the cost assignment setup.
  Incorrect Configuration: There may be a configuration issue in the cost center or internal order settings that allows for conflicting assignments.
  Data Entry Error: It could also be a result of incorrect data entry where the same cost element is mistakenly entered multiple times.
  
  Solution:
  
  Check Existing Assignments: Review the existing assignments for the cost object (RO &2) to see if SU &3 is already assigned. If it is, you will need to determine if you can modify or remove the existing assignment before adding the new one.
  Modify or Remove Duplicates: If the existing assignment is not needed, you can remove it. If it is needed, you may need to adjust your cost assignment strategy to avoid conflicts.
  Review Configuration: Check the configuration settings for the cost center or internal order to ensure that they are set up correctly and do not allow for conflicting assignments.
  Consult Documentation: Refer to SAP documentation or your organization's SAP support team for specific guidelines on handling cost assignments and resolving conflicts.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like KSB1 (Cost Centers: Actual Line Items) or KOB1 (Orders: Actual Line Items) to review cost assignments.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  User Roles: Ensure that you have the appropriate permissions to make changes to cost assignments in the system.
  
  If the issue persists after following these steps, it may be beneficial to engage with your SAP support team or a consultant who specializes in SAP Controlling (CO) to further investigate the problem.