How To Fix MAHD621 - Field catalog for SAP List Viewer not found

SAP Error Message - Details

• Message type: E = Error

• Message class: MAHD - Messages for Alternative Historical Data

• Message number: 621

• Message text: Field catalog for SAP List Viewer not found

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MAHD621 - Field catalog for SAP List Viewer not found ?

  The SAP error message MAHD621, which states "Field catalog for SAP List Viewer not found," typically occurs when there is an issue with the configuration or setup of the field catalog in the SAP List Viewer (ALV). This error can prevent the ALV from displaying data correctly.
  Causes:
  
  Missing Field Catalog: The field catalog that defines the structure and properties of the fields to be displayed in the ALV is not defined or is missing.
  Incorrect Program Logic: The program or report that is trying to display the ALV may not be correctly initializing or passing the field catalog.
  Authorization Issues: There may be authorization issues preventing access to the field catalog.
  Data Dictionary Changes: Changes in the underlying data dictionary (like changes in table structures) may lead to inconsistencies in the field catalog.
  
  Solutions:
  
  
  Check Field Catalog Definition:
  
  
  Ensure that the field catalog is defined correctly in your program. You can define a field catalog using the LVC_S_FCAT structure in your ABAP code.
  
  
  Example:
  DATA: lt_fieldcat TYPE lvc_t_fcat,
        ls_fieldcat TYPE lvc_s_fcat.
  
  CLEAR ls_fieldcat.
  ls_fieldcat-fieldname = 'FIELD_NAME'.
  ls_fieldcat-seltext_m = 'Field Description'.
  APPEND ls_fieldcat TO lt_fieldcat.
  
  
  
  
  Review Program Logic:
  
  Check the program logic to ensure that the field catalog is being populated and passed to the ALV function module (e.g., REUSE_ALV_GRID_DISPLAY or REUSE_ALV_LIST_DISPLAY).
  Ensure that the field catalog is not being cleared or overwritten unintentionally.
  
  
  
  Authorization Check:
  
  Verify that the user has the necessary authorizations to access the field catalog and the data being displayed.
  
  
  
  Debugging:
  
  Use the debugger to step through the code where the ALV is being called. Check if the field catalog is being populated correctly before the ALV display function is called.
  
  
  
  Check for Data Dictionary Changes:
  
  If there have been recent changes to the data dictionary (like adding or removing fields), ensure that the field catalog is updated accordingly.
  
  
  
  SAP Notes:
  
  Check for any relevant SAP Notes that may address this specific error. Sometimes, there are known issues or patches that can resolve the problem.
  
  
  
  Related Information:
  
  ALV Documentation: Familiarize yourself with the ALV documentation in SAP, which provides guidelines on how to set up and use field catalogs.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they have found.
  ABAP Development: If you are an ABAP developer, ensure you are following best practices for ALV reporting and field catalog management.
  
  By following these steps, you should be able to identify and resolve the MAHD621 error in your SAP environment.