DDLS449 - Return parameter &: & is a generated proxy type and cannot be used

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 449

• Message text: Return parameter &: & is a generated proxy type and cannot be used

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS449 - Return parameter &: & is a generated proxy type and cannot be used ?

  The SAP error message DDLS449 indicates that there is an issue with the use of a generated proxy type in a function module or method. This error typically arises when you are trying to use a return parameter that is defined as a proxy type, which is not allowed in certain contexts.
  Cause:
  
  Proxy Type Usage: The error occurs when a return parameter is defined as a generated proxy type (often used in web services) and is being used in a way that is not supported. Proxy types are typically generated for communication between systems and may not be directly usable in all contexts.
  Function Module or Method Definition: The function module or method you are trying to call may have been defined incorrectly, or you may be trying to use it in a way that is not compatible with the proxy type.
  
  Solution:
  
  Check Function Module/Method Definition: Review the definition of the function module or method you are trying to call. Ensure that the return parameters are defined correctly and are not using proxy types where they shouldn't be.
  Use Compatible Data Types: If you need to return data, consider using standard data types or structures instead of proxy types. You may need to create a new structure that can hold the data you want to return.
  Modify Proxy Generation: If you have control over the proxy generation, you may want to modify the way the proxy is generated to ensure that it is compatible with the function module or method you are using.
  Check for Updates: Ensure that your SAP system is up to date, as there may be patches or updates that address issues related to proxy types and their usage.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on proxy types and their usage in function modules and methods.
  SAP Community: Check the SAP Community forums for discussions related to this error message. Other users may have encountered similar issues and can provide insights or solutions.
  Debugging: Use the ABAP debugger to trace the execution of your code and identify where the error is occurring. This can help you pinpoint the exact cause of the issue.
  
  By following these steps, you should be able to resolve the DDLS449 error and ensure that your function modules or methods are using the correct data types for return parameters.