How To Fix COM_DIFF_KEY026 - Key type &1 of set type &2 is not compatible with key type &3

SAP Error Message - Details

• Message type: E = Error

• Message class: COM_DIFF_KEY - Messages for Differentiation Key

• Message number: 026

• Message text: Key type &1 of set type &2 is not compatible with key type &3

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message COM_DIFF_KEY026 - Key type &1 of set type &2 is not compatible with key type &3 ?

  The SAP error message COM_DIFF_KEY026 indicates that there is a mismatch in key types when working with characteristic sets in the SAP system. This error typically arises in the context of SAP's configuration and master data management, particularly when dealing with characteristics and their associated values in the context of variant configuration or classification.
  Cause:
  The error occurs when you attempt to use a key type that is not compatible with the expected key type for a specific set type. This can happen in scenarios such as:
  
  Inconsistent Configuration: The configuration of the characteristic set does not match the expected key types defined in the system.
  Incorrect Assignment: You may be trying to assign a characteristic or value that does not belong to the expected set type.
  Data Migration Issues: If data has been migrated from another system or if there have been changes in the configuration, it may lead to inconsistencies in key types.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Configuration: Review the configuration of the characteristic sets and ensure that the key types are correctly defined and compatible. You can do this in the SAP GUI by navigating to the relevant configuration settings.
  
  
  Validate Assignments: Ensure that the characteristics and values you are trying to use are correctly assigned to the appropriate set type. Check if the characteristic is defined for the set type you are working with.
  
  
  Review Data: If this error occurs during data entry or processing, check the data being used for any inconsistencies. Ensure that the data adheres to the expected formats and types.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific details on the key types and set types you are working with. This can provide insights into what is expected.
  
  
  Debugging: If you have access to debugging tools, you can trace the execution to see where the mismatch occurs. This can help identify the specific characteristic or value causing the issue.
  
  
  Contact Support: If the issue persists and you are unable to resolve it, consider reaching out to SAP support or your internal SAP team for further assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CT04 (for characteristics) and CT05 (for characteristic groups) to manage and review your configuration.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional context or solutions.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the root cause of the COM_DIFF_KEY026 error and implement a suitable solution.