How To Fix SO2_TAGLIB034 - No generic types allowed after TYPE REF TO

SAP Error Message - Details

• Message type: E = Error

• Message class: SO2_TAGLIB - Editor for BSP Extensions

• Message number: 034

• Message text: No generic types allowed after TYPE REF TO

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SO2_TAGLIB034 - No generic types allowed after TYPE REF TO ?

  The SAP error message SO2_TAGLIB034 indicates that there is an issue with the use of generic types in your ABAP code, specifically when they are used after a TYPE REF TO declaration. This error typically arises in the context of ABAP Object-Oriented programming when you are trying to define a reference type that is not allowed in that context.
  Cause:
  The error occurs when you attempt to define a reference type that includes generics (like TYPE REF TO <generic_type>) after a TYPE REF TO declaration. In ABAP, you cannot use generic types in certain contexts, particularly when they are expected to be concrete types.
  Solution:
  To resolve this error, you should ensure that you are not using generic types inappropriately. Here are some steps you can take:
  
  
  Check Type Declarations: Review your type declarations and ensure that you are not trying to use a generic type after a TYPE REF TO declaration. If you need to use a generic type, consider defining it in a different way.
  
  
  Use Concrete Types: If possible, replace the generic type with a concrete type that is compatible with your use case. This means specifying a specific class or interface instead of a generic one.
  
  
  Refactor Code: If your design requires the use of generics, consider refactoring your code to avoid the use of TYPE REF TO in the context where the error occurs. You might need to redesign your class or method to accommodate this.
  
  
  Check for Compatibility: Ensure that the types you are using are compatible with the context in which they are being declared. Sometimes, the error can arise from a mismatch in expected types.
  
  
  Related Information:
  
  ABAP Generics: In ABAP, generics allow for more flexible and reusable code, but they come with certain restrictions. Understanding how and where to use them is crucial.
  ABAP Documentation: Refer to the official SAP documentation for more details on type declarations and object-oriented programming in ABAP.
  Debugging: Use the ABAP debugger to step through your code and identify the exact line where the error occurs. This can help you pinpoint the issue more effectively.
  
  By following these steps, you should be able to resolve the SO2_TAGLIB034 error and ensure that your ABAP code adheres to the language's type system rules.