How To Fix SALV_X_API090 - No key fields defined

SAP Error Message - Details

• Message type: E = Error

• Message class: SALV_X_API - Messages for ALV API exceptions

• Message number: 090

• Message text: No key fields defined

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SALV_X_API090 - No key fields defined ?

  The SAP error message SALV_X_API090: No key fields defined typically occurs when you are trying to use the SAP ALV (ABAP List Viewer) functionality without having defined any key fields for the ALV grid. Key fields are essential for uniquely identifying records in the dataset being displayed.
  Cause:
  
  No Key Fields Defined: The primary cause of this error is that the ALV grid is being initialized without specifying any key fields. Key fields are necessary for the ALV to manage the data correctly, especially for operations like sorting, filtering, and updating.
  Incorrect Data Structure: The data structure being passed to the ALV might not have any fields marked as key fields.
  Improper Configuration: The configuration of the ALV might be incorrect, leading to the absence of key fields.
  
  Solution:
  To resolve the error, you need to ensure that key fields are defined in your ALV grid setup. Here are the steps to do that:
  
  
  Define Key Fields: When you create the field catalog for the ALV, make sure to specify which fields are key fields. This can be done by setting the KEY attribute in the field catalog.
  Example:
  DATA: lt_fieldcat TYPE lvc_t_fcat,
        ls_fieldcat TYPE lvc_s_fcat.
  
  CLEAR ls_fieldcat.
  ls_fieldcat-fieldname = 'FIELD1'.
  ls_fieldcat-key = 'X'. " Mark this field as a key field
  APPEND ls_fieldcat TO lt_fieldcat.
  
  CLEAR ls_fieldcat.
  ls_fieldcat-fieldname = 'FIELD2'.
  ls_fieldcat-key = ''. " Not a key field
  APPEND ls_fieldcat TO lt_fieldcat.
  
  
  Check Data Structure: Ensure that the internal table or data structure you are passing to the ALV has the necessary fields defined as key fields in the data dictionary.
  
  
  Review ALV Initialization: When initializing the ALV, ensure that you are passing the correct field catalog and data table. The ALV function module or class should be called with the appropriate parameters.
  
  
  Debugging: If you are still facing issues, you can debug the program to check the contents of the field catalog and the data being passed to the ALV. This will help you identify if the key fields are being set correctly.
  
  
  Related Information:
  
  ALV Documentation: Refer to the SAP documentation on ALV for more details on how to set up field catalogs and key fields.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to ALV and key fields.
  Community Forums: SAP Community and other forums can be helpful for finding similar issues faced by other developers and their solutions.
  
  By ensuring that key fields are properly defined and configured, you should be able to resolve the SALV_X_API090 error and successfully display your data in the ALV grid.