How To Fix KT256 - Plan integration with cost center accoounting can no longer be changed

KT256 - Overview

• Message type: E = Error

• Message class: KT - RK Message Table Maintenance

• Message number: 256

• Message text: Plan integration with cost center accoounting can no longer be changed

What causes this issue?

The <ZH>Planning integration with Cost Center Accounting</> indicator
can only be set as long as no plan data exists for orders with
integrated planning in the controlling area.
The SAP System determined that plan data for orders with integrated
planning exists on the controlling area/version/fiscal year (&V1&/&V2&/
&V3&) level. You cannot change the indicator.

Error message extract from SAP system. Copyright SAP SE.

KT256 - Details

• The SAP error message KT256, which states "Plan integration with cost center accounting can no longer be changed," typically occurs in the context of planning and budgeting within SAP's Controlling (CO) module. This error indicates that the integration settings for planning with cost center accounting have been locked or cannot be modified due to certain conditions.
  Causes:
  
  Period Locking: The planning period may be locked, preventing any changes to the integration settings.
  Completed Planning Cycle: If the planning cycle has been completed or closed, changes to the integration settings will not be allowed.
  Authorization Issues: The user may not have the necessary authorizations to make changes to the planning integration settings.
  Configuration Settings: The system configuration may have been set in such a way that it restricts changes to the integration settings after a certain point.
  Data Consistency: There may be existing data that conflicts with the proposed changes, leading to a restriction on modifying the