How To Fix COM_DIFF_KEY021 - Other set types exist for key type & in the system

COM_DIFF_KEY021 - Overview

• Message type: E = Error

• Message class: COM_DIFF_KEY - Messages for Differentiation Key

• Message number: 021

• Message text: Other set types exist for key type & in the system

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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Smart SAP Assistant

• What is the cause and solution for SAP error message COM_DIFF_KEY021 - Other set types exist for key type & in the system ?

  The SAP error message COM_DIFF_KEY021 indicates that there are multiple set types associated with the same key type in the system. This can occur in the context of SAP's Controlling (CO) module, particularly when dealing with cost elements, cost centers, or other master data that uses key types.
  
  Cause:
  The error typically arises when:
  
  There are conflicting definitions for the same key type in the system.
  The system is trying to process a transaction or configuration that requires a unique set type for a specific key type, but multiple set types are defined.
  There may be inconsistencies in the configuration of the controlling area or other related settings.
  
  
  Solution:
  To resolve the COM_DIFF_KEY021 error, you can follow these steps:
  
  
  Check Set Types:
  
  Go to the configuration settings in SAP (Transaction code: SPRO).
  Navigate to the relevant area (e.g., Controlling -> Cost Element Accounting -> Master Data -> Define Set Types).
  Review the set types defined for the key type in question