How To Fix SOS_MAPPING148 - The TYPE field can only exist in the root class

SAP Error Message - Details

• Message type: E = Error

• Message class: SOS_MAPPING - Object Services: Persistence Mapping for Messages

• Message number: 148

• Message text: The TYPE field can only exist in the root class

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SOS_MAPPING148 - The TYPE field can only exist in the root class ?

  The SAP error message SOS_MAPPING148 indicates that there is an issue with the mapping of a type field in the context of class inheritance in the SAP system. Specifically, this error occurs when the TYPE field is defined in a subclass rather than in the root class of an inheritance hierarchy. 
  Cause:
  
  Inheritance Structure: In SAP ABAP Object-Oriented programming, the TYPE field should only be defined in the root class of an inheritance hierarchy. If it is defined in a subclass, the system raises this error.
  Mapping Issues: This error can also occur during the mapping of data types in certain contexts, such as when using the SAP Business Object Processing Framework (BOPF) or when working with data models that involve inheritance.
  
  Solution:
  
  Check Class Definition: Review the class definitions in your ABAP code. Ensure that the TYPE field is defined only in the root class and not in any subclasses.
  Refactor Code: If the TYPE field is incorrectly placed in a subclass, refactor your code to move the TYPE field definition to the root class.
  Recompile Classes: After making changes, recompile the affected classes to ensure that the changes take effect.
  Test the Changes: Execute the relevant transactions or programs to verify that the error has been resolved.
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for guidelines on class inheritance and the proper use of TYPE fields.
  SAP Community: Check the SAP Community forums for discussions related to SOS_MAPPING148, as other developers may have encountered and resolved similar issues.
  Debugging: Use the ABAP debugger to trace the execution flow and identify where the TYPE field is being incorrectly referenced.
  
  By following these steps, you should be able to resolve the SOS_MAPPING148 error and ensure that your class definitions adhere to the proper inheritance structure in SAP.