How To Fix DMC_RT_MSG157 - No header row found before the nametab rows.

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 157

• Message text: No header row found before the nametab rows.

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 DMC_RT_MSG157 - No header row found before the nametab rows. ?

  The SAP error message DMC_RT_MSG157 indicates that the system could not find a header row in the data being processed before the name table rows. This error typically occurs in the context of data migration or data import processes, particularly when using tools like SAP Data Migration Cockpit or SAP S/4HANA Migration.
  Cause:
  
  Missing Header Row: The most common cause is that the input file (e.g., CSV, Excel) does not contain a header row that defines the column names.
  Incorrect File Format: The file may not be formatted correctly, leading to the system's inability to recognize the header.
  Data Structure Issues: The structure of the data may not match the expected format, such as missing delimiters or incorrect data types.
  File Encoding Issues: Sometimes, the file encoding (e.g., UTF-8, ANSI) can cause issues in reading the header row.
  
  Solution:
  
  Check the Input File: Ensure that the input file has a header row that correctly defines the column names. The header should match the expected field names in the target system.
  Verify File Format: Make sure the file is in the correct format (e.g., CSV, Excel) and that it adheres to the expected structure.
  Review Data Structure: Ensure that the data structure matches the requirements of the migration tool. This includes checking for the correct number of columns and data types.
  Encoding Check: Verify that the file is saved with the correct encoding. If necessary, re-save the file using a compatible encoding format.
  Use Sample Files: If available, use sample files provided by SAP or the migration tool to ensure that your file structure aligns with the expected format.
  
  Related Information:
  
  Documentation: Refer to the official SAP documentation for the specific migration tool you are using. This documentation often includes examples of the required file formats and structures.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and to find additional troubleshooting tips.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on data migration issues.
  
  By following these steps, you should be able to resolve the DMC_RT_MSG157 error and successfully import your data into the SAP system.