How To Fix WXP421 - Enter a plan version for "Setup based on plan data"

WXP421 - Overview

• Message type: E = Error

• Message class: WXP - Retail Planning

• Message number: 421

• Message text: Enter a plan version for "Setup based on plan data"

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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WXP421 - Details

• SAP Error Message:
  WXP421 - Enter a plan version for "Setup based on plan data"
  
  
  Cause:
  This warning message appears in SAP when you are trying to execute a planning or setup transaction that requires a specific plan version to be entered, but the system does not find a valid plan version specified. The message typically occurs in the context of Production Planning (PP) or Demand Management, especially when working with planning versions in Material Requirements Planning (MRP) or Demand Planning.
  The system expects a plan version to be entered because the planning data (such as demand, supply, or production plans) is version-controlled. Without specifying the plan version, the system cannot determine which set of planning data to use.
  
  When does it occur?
  
  When running planning transactions that require a plan version (e.g., MRP run, planning table, or setup based on plan data).
  When the plan version field is left blank or the default plan version is