How To Fix GS406 - Only compare sets with a compatible table field; see documentation

SAP Error Message - Details

• Message type: E = Error

• Message class: GS - Sets

• Message number: 406

• Message text: Only compare sets with a compatible table field; see documentation

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message GS406 - Only compare sets with a compatible table field; see documentation ?

  The SAP error message GS406 ("Only compare sets with a compatible table field; see documentation") typically occurs in the context of ABAP programming when there is an attempt to compare two sets that are not compatible in terms of their data types or structures. This error is often encountered when using the SET operations in ABAP, particularly when dealing with internal tables or field symbols.
  Cause:
  
  Incompatible Data Types: The most common cause of this error is that the two sets being compared have different data types. For example, if one set is based on a character field and the other is based on a numeric field, the comparison will fail.
  Different Structures: If the sets are based on different structures or field definitions, this can also lead to compatibility issues.
  Incorrect Use of Field Symbols: If field symbols are used incorrectly or are not properly defined, it can lead to this error.
  
  Solution:
  
  Check Data Types: Ensure that the data types of the fields being compared are compatible. You can use the DESCRIBE FIELD statement to check the data type of the fields involved.
  Use Compatible Structures: Make sure that the structures of the internal tables or sets being compared are the same. If necessary, redefine the internal tables to have compatible structures.
  Field Symbol Definition: If you are using field symbols, ensure that they are correctly defined and point to compatible data types.
  Review Documentation: The error message suggests checking the documentation. You can refer to the SAP Help Portal or the ABAP documentation for more details on the specific operations you are performing.
  
  Related Information:
  
  ABAP Documentation: Look for the specific documentation related to the SET operations and data type compatibility in ABAP.
  SAP Community: You can search for similar issues in the SAP Community forums, where other developers may have encountered and resolved the same error.
  Debugging: Use the ABAP debugger to step through your code and identify where the incompatible comparison is occurring. This can help you pinpoint the exact cause of the error.
  
  By ensuring that the sets being compared are compatible in terms of data types and structures, you should be able to resolve the GS406 error.