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

RESCSU066 - Overview

• 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.

RESCSU066 - Details

• 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