How To Fix WER445 - Type &1 is not compatible with predefined types

SAP Error Message - Details

• Message type: E = Error

• Message class: WER - Messages for the package WER

• Message number: 445

• Message text: Type &1 is not compatible with predefined types

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WER445 - Type &1 is not compatible with predefined types ?

  SAP Error Message:
  
  WER445: Type &1 is not compatible with predefined types
  
  Cause:
  This error occurs when a data type used in a program, function module, or data dictionary object does not match or is incompatible with the expected predefined SAP data types. Typically, it happens during type checking or when assigning values between incompatible types, especially in ABAP Dictionary or ABAP code where strict type compatibility is enforced.
  Common scenarios include:
  
  Using a custom-defined type where a standard predefined type is expected.
  Assigning or comparing variables of incompatible types.
  Mismatch between the expected data type in a function module interface and the actual type used.
  Inconsistent or incorrect type declarations in structures, tables, or parameters.
  
  
  Solution:
  
  
  Check the Data Type Definition:
  
  Verify the data type &1 (the placeholder in the message will be replaced by the actual type name) in the ABAP Dictionary (SE11).
  Ensure that the type is correctly defined and compatible with the expected predefined SAP types.
  
  
  
  Review the Code or Interface:
  
  Inspect the ABAP code or function module interface where the error occurs.
  Make sure that the data types of variables, parameters, or fields match the expected predefined types exactly.
  Use standard SAP data types (e.g., CHAR, NUMC, INT4, DEC, etc.) where required.
  
  
  
  Adjust Type Declarations:
  
  If a custom type is used, consider redefining it or replacing it with a compatible predefined type.
  Use type casting or conversion functions if necessary to convert between types safely.
  
  
  
  Check for Type Compatibility in Structures and Tables:
  
  When structures or internal tables are involved, ensure that all fields have compatible types.
  Use consistent type definitions across related objects.
  
  
  
  Transport and System Consistency:
  
  Sometimes, inconsistencies arise due to transport issues or system upgrades.
  Re-import or re-activate the relevant objects.
  Run consistency checks in SE11 or SE14.
  
  
  
  
  Related Information:
  
  Transaction SE11: To check and maintain data types and structures.
  Transaction SE80: To review ABAP programs and function modules.
  ABAP Documentation: For understanding predefined data types and type compatibility rules.
  SAP Notes: Search for specific SAP Notes related to WER445 for any known issues or patches.
  Type Compatibility in ABAP: ABAP enforces strict type compatibility, especially in newer releases and with the introduction of new data types.
  
  
  Summary:
  The WER445 error indicates a type incompatibility issue. The fix involves verifying and aligning the data types used in your ABAP objects with the predefined SAP types expected by the system. Correcting the type definitions or adjusting the code to use compatible types will resolve the error.