How To Fix D7020 - &1 returned with exception WRONG_TYPECLASS

SAP Error Message - Details

• Message type: E = Error

• Message class: D7 - Messages for Development Class SDBO

• Message number: 020

• Message text: &1 returned with exception WRONG_TYPECLASS

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message D7020 - &1 returned with exception WRONG_TYPECLASS ?

  The SAP error message D7020 with the exception WRONG_TYPECLASS typically indicates that there is a mismatch in the expected data type or class for a particular operation or function in the SAP system. This error can occur in various contexts, such as during data processing, function module calls, or when working with specific data structures.
  Cause:
  
  Data Type Mismatch: The most common cause is that the data being processed does not match the expected type. For example, if a function module expects a certain type of input (like a string or integer) but receives a different type, this error can occur.
  Incorrect Configuration: Sometimes, the configuration settings in the system may not align with the expected data types, leading to this error.
  Programming Errors: If custom ABAP code is involved, there may be programming errors where the wrong data types are being passed to functions or methods.
  
  Solution:
  
  Check Data Types: Review the data types of the variables being passed to the function or method that triggered the error. Ensure that they match the expected types as defined in the function module or method signature.
  Debugging: Use the SAP debugger to trace the execution of the program and identify where the data type mismatch occurs. This can help pinpoint the exact location and context of the error.
  Review Function Module Documentation: Check the documentation for the function module or method being called to understand the expected input parameters and their data types.
  Adjust Configuration: If the error is related to configuration settings, review and adjust them to ensure they align with the expected data types.
  Consult SAP Notes: Look for any relevant SAP Notes that may address this specific error or provide guidance on similar issues.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for the specific function module or method to understand its parameters and expected data types.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found.
  ABAP Development: If you are a developer, ensure that you are following best practices for data type handling in ABAP, including using appropriate data declarations and type checks.
  
  If the issue persists after trying the above solutions, it may be beneficial to involve your SAP Basis or ABAP development team for further investigation.