How To Fix SALV_X_API123 - Conversion from EXT to INT not possible for CONSTANT column

SAP Error Message - Details

• Message type: E = Error

• Message class: SALV_X_API - Messages for ALV API exceptions

• Message number: 123

• Message text: Conversion from EXT to INT not possible for CONSTANT column

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SALV_X_API123 - Conversion from EXT to INT not possible for CONSTANT column ?

  The SAP error message SALV_X_API123: Conversion from EXT to INT not possible for CONSTANT column typically occurs when there is an issue with data type conversion in the context of using the SAP ALV (ABAP List Viewer) framework, particularly when dealing with constant columns in an ALV grid or list.
  Cause:
  This error usually arises due to the following reasons:
  
  
  Data Type Mismatch: The ALV is trying to convert a field from an external representation (like a string or character type) to an internal representation (like an integer) but fails because the data types are incompatible.
  
  
  Constant Columns: If you are trying to display a constant value in the ALV that is expected to be of a different type than what is defined in the data dictionary or the ALV configuration, this error can occur.
  
  
  Field Definitions: The field definitions in the ALV layout may not match the underlying data structure, leading to conversion issues.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Data Types: Ensure that the data types of the fields in your internal table match the expected types in the ALV layout. If you are using a constant column, make sure that its type is compatible with the expected type.
  
  
  Adjust ALV Field Catalog: When defining the field catalog for the ALV, ensure that the field types are correctly specified. If you are using a constant, ensure that it is defined as a string or character type if it is being displayed as such.
  
  
  Modify the Data Structure: If necessary, modify the data structure of the internal table to ensure that the types align with what the ALV expects. You may need to convert the data explicitly before passing it to the ALV.
  
  
  Debugging: Use debugging tools to trace the data flow and identify where the conversion is failing. Check the values being passed to the ALV and their types.
  
  
  Review ALV Configuration: If you are using a custom ALV implementation, review the configuration and ensure that all fields are correctly defined and that there are no discrepancies in the expected data types.
  
  
  Related Information:
  
  ALV Documentation: Refer to the SAP documentation on ALV for more details on field catalogs and data types.
  ABAP Data Types: Familiarize yourself with ABAP data types and how they interact with ALV to avoid similar issues in the future.
  SAP Notes: Check SAP Notes for any known issues or patches related to the ALV framework that might address this error.
  
  By following these steps, you should be able to identify and resolve the issue causing the SALV_X_API123 error in your SAP application.