How To Fix W8124 - Conversion of data type & to data type & is not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: W8 - Workflow: Expressions, data flow

• Message number: 124

• Message text: Conversion of data type & to data type & is not supported

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message W8124 - Conversion of data type & to data type & is not supported ?

  Certainly! Here's a detailed explanation for the SAP error message W8124: Conversion of data type & to data type & is not supported:
  
  Error Message
  W8124 Conversion of data type & to data type & is not supported
  
  Cause
  This warning occurs when there is an attempt to convert data from one data type to another, but the conversion is not supported by the SAP system. The placeholders & represent the source and target data types involved in the conversion.
  Common scenarios include:
  
  Trying to convert complex or incompatible data types directly (e.g., converting a structure or internal table to a simple data type).
  Using implicit or explicit type conversions in ABAP code that are not allowed.
  Assigning or moving data between incompatible types without proper conversion routines.
  Using function modules, methods, or statements that expect certain data types but receive incompatible ones.
  
  
  Solution
  To resolve this warning, consider the following steps:
  
  
  Check Data Types:
  
  Verify the source and target data types involved in the conversion.
  Use the ABAP Dictionary (SE11) or the ABAP editor to inspect the data types.
  
  
  
  Use Proper Conversion Methods:
  
  For simple data types (e.g., numeric to string), use built-in conversion functions or statements like CONV, MOVE, or string templates.
  For complex types (structures, internal tables), convert field by field or use serialization/deserialization methods.
  
  
  
  Explicit Conversion:
  
  Use explicit conversion functions or statements to convert data types safely.
  For example, use cl_abap_conv_in_ce or cl_abap_conv_out_ce classes for complex conversions.
  
  
  
  Avoid Unsupported Conversions:
  
  Do not assign incompatible types directly.
  If necessary, redesign the data flow or data structures to avoid such conversions.
  
  
  
  Check the Code Context:
  
  Look at the ABAP code or the program logic where the warning occurs.
  Adjust the code to ensure compatible data types are used.
  
  
  
  Use Debugging:
  
  Debug the program to see the exact point where the conversion is attempted.
  Inspect variable types and values.
  
  
  
  
  Related Information
  
  ABAP Data Types: Understanding elementary, complex, and reference types is crucial.
  Type Conversion in ABAP: Use statements like MOVE, CONV, and functions/classes designed for conversion.
  SAP Notes: Check SAP Notes for any known issues related to this warning.
  ABAP Documentation: Refer to SAP Help Portal for data type conversion rules.
  Common ABAP Statements:
  
  MOVE and MOVE-CORRESPONDING
  CONV operator (introduced in newer ABAP versions)
  String templates for formatting and conversion
  
  
  
  
  Example
  If you try to assign an internal table directly to a string variable:
  DATA: lt_data TYPE TABLE OF string,
        lv_string TYPE string.
  
  lv_string = lt_data. " This will cause W8124 warning
  Correct approach:
  Convert the internal table to a string using serialization or loop through the table and concatenate:
  DATA: lt_data TYPE TABLE OF string,
        lv_string TYPE string.
  
  LOOP AT lt_data INTO DATA(lv_line).
    CONCATENATE lv_string lv_line cl_abap_char_utilities=>newline INTO lv_string.
  ENDLOOP.
  
  If you provide the exact data types involved (from the message placeholders), I can help with a more specific solution.