How To Fix KG339 - The planning period and the reference period cannot overlap

KG339 - Overview

• Message type: E = Error

• Message class: KG - CO-PA Planning

• Message number: 339

• Message text: The planning period and the reference period cannot overlap

What causes this issue?

If the plan version for the plan data and reference data is the same,
the two time periods cannot overlap.

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

How to fix this error?

Use the function "Change complete plan" if you want to edit a plan
version with certain planning functions (period distribution,
revaluation, valuation).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KG339 - The planning period and the reference period cannot overlap ?

  The SAP error message KG339, "The planning period and the reference period cannot overlap," typically occurs in the context of planning and budgeting within SAP, particularly in modules like SAP Controlling (CO) or SAP Integrated Business Planning (IBP). This error indicates that there is a conflict between the planning period you are trying to use and a reference period that has already been defined.
  
  Cause:
  The error arises when:
  
  Overlapping Dates: The planning period you are trying to set overlaps with an existing reference period. For example, if your planning period is set from January 1 to March 31, and there is a reference period that also includes any dates within that range, the system will throw this error.
  Incorrect Configuration: The configuration settings for planning periods and reference periods may not be set up correctly, leading to overlaps.
  Data Entry Errors: There may be mistakes in the data entry of the planning or reference