How To Fix TB851 - No comparison. The table contains strings

SAP Error Message - Details

• Message type: E = Error

• Message class: TB - SM31 table maintenance messages

• Message number: 851

• Message text: No comparison. The table contains strings

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message TB851 - No comparison. The table contains strings ?

  The SAP error message TB851 "No comparison. The table contains strings" typically occurs when there is an attempt to perform a comparison operation on a table that contains string data types, but the operation is not valid for those data types. This can happen in various scenarios, such as when using ABAP code to compare values in a table or when using certain function modules or reports that expect numeric data types.
  Cause:
  
  Data Type Mismatch: The error usually arises when the program tries to compare string values (e.g., CHAR, STRING) in a way that is not supported. For example, comparing strings using numeric comparison operators.
  Incorrect Logic: The logic in the ABAP code may be incorrectly set up to handle string comparisons, leading to this error.
  Function Module Limitations: Some function modules or methods may not support string comparisons directly.
  
  Solution:
  
  Check Data Types: Ensure that the data types of the variables or fields being compared are compatible. If you are comparing strings, make sure you are using string comparison methods.
  Use Appropriate Comparison Operators: Use string comparison operators (e.g., = for equality, <> for inequality) instead of numeric operators.
  Debugging: Use the ABAP debugger to step through the code and identify where the comparison is being made. Check the values and types of the variables involved.
  Convert Data Types: If necessary, convert the data types to ensure that the comparison is valid. For example, if you need to compare a string to a number, convert the string to a number using appropriate conversion functions.
  Review Function Module Documentation: If the error occurs in a function module, review the documentation to ensure that you are using it correctly and that the input parameters are of the expected types.
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for details on data types and comparison operations.
  SAP Community: Check the SAP Community forums for similar issues and solutions shared by other developers.
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide additional context.
  
  By following these steps, you should be able to identify the cause of the TB851 error and implement a solution to resolve it.