How To Fix DMC_RT_MSG129 - Sheet &1 / Field &2 unknown

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 129

• Message text: Sheet &1 / Field &2 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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_RT_MSG129 - Sheet &1 / Field &2 unknown ?

  The SAP error message DMC_RT_MSG129, which states "Sheet &1 / Field &2 unknown," typically occurs in the context of data migration or data management processes, particularly when using tools like SAP Data Migration Cockpit (DMC) or SAP S/4HANA Migration Cockpit. This error indicates that the system is unable to recognize a specified sheet or field in the data file being processed.
  Cause:
  
  Incorrect Sheet Name: The specified sheet name in the data file does not match any of the expected sheet names defined in the migration template.
  Missing Field: The specified field does not exist in the defined structure of the migration template or is misspelled.
  File Format Issues: The data file may not be in the correct format (e.g., Excel, CSV) or may have formatting issues that prevent proper reading.
  Template Version Mismatch: The template being used may not be compatible with the version of the migration tool or the target system.
  Data Mapping Issues: There may be issues with how the fields are mapped in the migration cockpit.
  
  Solution:
  
  Verify Sheet Name: Check the data file to ensure that the sheet name matches exactly with what is expected in the migration template.
  Check Field Names: Ensure that all field names in the data file are spelled correctly and match the expected field names in the migration template.
  Review File Format: Make sure the data file is in the correct format and adheres to any required specifications (e.g., no merged cells, correct data types).
  Use the Correct Template: Ensure that you are using the correct version of the migration template that corresponds to your SAP system version.
  Mapping Review: Review the mapping configuration in the migration cockpit to ensure that all fields are correctly mapped and that there are no discrepancies.
  Consult Documentation: Refer to the official SAP documentation for the Data Migration Cockpit for any specific requirements or guidelines related to the data file structure.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or updates related to the DMC error messages.
  Migration Cockpit Documentation: Review the official SAP documentation for the Data Migration Cockpit for detailed instructions on preparing data files and using templates.
  Community Forums: Engage with SAP community forums or support channels for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the DMC_RT_MSG129 error in your SAP data migration process.