How To Fix SY175 - Comparisons between type & and type & not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: SY - ABAP/4 system messages

• Message number: 175

• Message text: Comparisons between type & and type & not supported

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SY175 - Comparisons between type & and type & not supported ?

  The SAP error message SY175 indicates that there is an issue with type comparison in your ABAP code. This error typically arises when you attempt to compare two variables of incompatible data types. The message format usually looks like this: "Comparisons between type & and type & not supported," where the two types are specified in the message.
  Cause
  The primary causes of this error include:
  
  Incompatible Data Types: You are trying to compare two variables that are of different data types that cannot be compared directly. For example, comparing a character string with a numeric value.
  Type Mismatch in Conditions: This can occur in conditional statements (like IF, CASE, etc.) where the types of the operands do not match.
  Implicit Type Conversion Failure: ABAP does not automatically convert between certain types, especially between complex types or when the conversion could lead to data loss.
  
  Solution
  To resolve the SY175 error, you can take the following steps:
  
  
  Check Data Types: Review the data types of the variables involved in the comparison. Ensure that they are compatible. You can use the ABAP Data Dictionary (SE11) to check the definitions of the data types.
  
  
  Explicit Type Conversion: If the types are indeed different but you need to compare them, you can perform an explicit type conversion. For example:
  
  Use CONCATENATE to convert numbers to strings if you are comparing a string with a number.
  Use CAST or CONVERT functions to convert between compatible types.
  
  
  
  Modify Logic: If the comparison is logically incorrect (e.g., comparing a date with a string), you may need to rethink the logic of your code to ensure that you are comparing the correct types.
  
  
  Use Type-Safe Comparisons: Ensure that you are using type-safe comparisons. For example, if you are comparing a field from a database table, ensure that the variable you are comparing it to is of the same type.
  
  
  Example
  Here’s a simple example that could lead to this error:
  DATA: lv_number TYPE i,
        lv_string TYPE string.
  
  lv_number = 10.
  lv_string = '10'.
  
  IF lv_number = lv_string.  " This will cause SY175
    " Do something
  ENDIF.
  To fix this, you can convert lv_number to a string:
  IF lv_string = CONDENSE( lv_number ).  " This will work
    " Do something
  ENDIF.
  Related Information
  
  ABAP Data Types: Familiarize yourself with the different data types in ABAP and their compatibility.
  ABAP Documentation: Refer to the official SAP documentation for more details on data types and type conversion.
  Debugging: Use the ABAP debugger to inspect the values and types of variables at runtime to identify where the type mismatch occurs.
  
  By following these steps, you should be able to resolve the SY175 error and ensure that your comparisons are valid.