How To Fix CNV_DMC_UI_FW_EXCEPT004 - Attribute &1 of class &2 is unknown.

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_UI_FW_EXCEPT - Messages for exception classes

• Message number: 004

• Message text: Attribute &1 of class &2 is unknown.

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 CNV_DMC_UI_FW_EXCEPT004 - Attribute &1 of class &2 is unknown. ?

  The SAP error message CNV_DMC_UI_FW_EXCEPT004 Attribute &1 of class &2 is unknown typically occurs in the context of the SAP Data Migration Cockpit (DMC) or during data migration processes. This error indicates that the system is trying to access an attribute (field) of a specific class (object type) that is not recognized or does not exist in the current context.
  Causes:
  
  Incorrect Configuration: The attribute specified in the error message may not be correctly defined in the migration object or may not exist in the target system.
  Version Mismatch: There may be a mismatch between the source and target systems, especially if the migration object was created or modified in a different version of SAP.
  Data Model Changes: Changes in the data model (e.g., new fields added, fields removed) in the source or target system can lead to this error.
  Custom Fields: If the migration object is trying to access custom fields that are not present in the target system, this error can occur.
  
  Solutions:
  
  Check Migration Object Configuration: Verify the configuration of the migration object in the SAP Data Migration Cockpit. Ensure that all attributes are correctly defined and match the target system's data model.
  Update Data Model: If there have been changes to the data model, ensure that the migration object is updated accordingly. This may involve regenerating the migration object or adjusting the mapping.
  Review Custom Fields: If you are using custom fields, ensure that they are present in the target system and correctly defined in the migration object.
  Consult Documentation: Refer to the SAP documentation for the Data Migration Cockpit to ensure that you are following the correct procedures and that your configurations are valid.
  Debugging: If you have access to the development environment, you can debug the process to identify where the error is occurring and gather more context about the unknown attribute.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide guidance on similar issues.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered and resolved similar issues.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, providing them with the error details and context.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.