How To Fix SY174 - Conversion from type & to type & not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: SY - ABAP/4 system messages

• Message number: 174

• Message text: Conversion from type & to type & not supported

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SY174 - Conversion from type & to type & not supported ?

  The SAP error message SY174 indicates that there is an issue with data type conversion in your ABAP program. This error occurs when the system attempts to convert a value from one data type to another, but the conversion is not supported. This can happen in various scenarios, such as when you are trying to assign a value of one data type to a variable of another incompatible data type.
  Causes of SY174 Error
  
  
  Incompatible Data Types: The most common cause is that the source and target data types are not compatible. For example, trying to assign a character string to a numeric variable without proper conversion.
  
  
  Implicit Conversion Failure: ABAP sometimes performs implicit conversions, but if the conversion is not possible (e.g., trying to convert a string that does not represent a number to a numeric type), this error will occur.
  
  
  Incorrect Field Definitions: If the fields in a structure or table are defined with incompatible types, this can lead to conversion errors when trying to move data between them.
  
  
  Function Module or Method Calls: If you are passing parameters to a function module or method that expects a different data type than what you are providing, this error can occur.
  
  
  Solutions to SY174 Error
  
  
  Check Data Types: Review the data types of the variables involved in the conversion. Ensure that they are compatible. You can use the ABAP Data Dictionary (SE11) to check the definitions.
  
  
  Explicit Conversion: If implicit conversion is failing, you can use explicit conversion functions like CONVERT, CAST, or WRITE to convert the data types properly. For example:
  DATA: lv_string TYPE string,
        lv_number TYPE i.
  
  lv_string = '123'.
  lv_number = lv_string. " This will cause SY174
  lv_number = lv_string + 0. " This will work
  
  
  Use Appropriate Functions: If you are dealing with strings and numbers, consider using functions like CONCATENATE, REPLACE, or CONVERT_TO_STRING to ensure proper formatting before assignment.
  
  
  Debugging: Use the ABAP debugger to step through the code and identify the exact line where the error occurs. This can help you understand which variables are causing the issue.
  
  
  Check Function Module Signatures: If the error occurs during a function call, check the parameter types in the function module or method signature to ensure you are passing the correct types.
  
  
  Related Information
  
  ABAP Data Types: Familiarize yourself with the different data types in ABAP, such as CHAR, NUMC, INT, FLOAT, etc., and their compatibility.
  ABAP Documentation: Refer to the official SAP documentation for more details on data type conversions and best practices.
  Error Handling: Implement error handling in your code to gracefully manage situations where data type conversions might fail.
  
  By following these steps, you should be able to identify the cause of the SY174 error and implement a solution to resolve it.