How To Fix AH773 - Not possible to change the rate category

AH773 - Overview

• Message type: E = Error

• Message class: AH - IS-U billing (master data)

• Message number: 773

• Message text: Not possible to change the rate category

What causes this issue?

You changed the rate category for installation &v1& on &v2&. A
period-end billing has been established for this installation. The
current period-end billing period starts on &v3&. You are not permitted
to change the rate category within the current period-end billing
period.

System Response

How to fix this error?

If you wish to change the rate category, you can do so at the start of
the next period-end billing period. You can end the period-end billing
period early by executing a final billing.

Error message extract from SAP system. Copyright SAP SE.

AH773 - Details

• The SAP error message AH773, which states "Not possible to change the rate category," typically occurs in the context of SAP's Controlling (CO) module, particularly when dealing with internal orders, cost centers, or other cost objects. This error usually arises when there is an attempt to change the rate category of a cost object that is already in use or has been posted to.
  Causes:
  
  Existing Transactions: The rate category may be locked because there are existing transactions or postings associated with the cost object.
  Status of the Cost Object: The cost object may be in a status that does not allow changes to the rate category (e.g., it may be closed or settled).
  Configuration Settings: The system configuration may restrict changes to the rate category under certain conditions.
  Authorization Issues: The user may not have the necessary authorizations to make changes to the rate category.
  
  Solutions:
  
  Check for Existing Transactions: Review the cost object for any