How To Fix DO839 - Generic table type not allowed (& uses)

SAP Error Message - Details

• Message type: E = Error

• Message class: DO - Dictionary: Mass activation of domains and data elements

• Message number: 839

• Message text: Generic table type not allowed (& uses)

What causes this issue?

INCLUDE DDDOC_GENERIC_TTYP OBJECT DOKU ID TX
You defined the table type as generic although it is already being used
in other table types as line type and/or in structures as component
type.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Change the attributes of the table type so that it is no longer generic
or determine the user (other table types and structures) using the
where-used list and remove the use of the table type from the
where-used list.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DO839 - Generic table type not allowed (& uses) ?

  The SAP error message DO839, which states "Generic table type not allowed (& uses)," typically occurs when you are trying to use a generic table type in a context where it is not permitted. This can happen in various scenarios, such as when defining parameters for function modules, methods, or when working with data types in ABAP programs.
  Cause:
  
  Generic Table Type: The error arises because the ABAP program is attempting to use a generic table type (like TABLE OF ANY TYPE) in a situation where a specific table type is required.
  Function Module/Method Parameters: If you are passing a table parameter to a function module or method that expects a specific table type, using a generic type will trigger this error.
  Data Declaration: Declaring a variable with a generic table type in a context that requires a specific structure or type can also lead to this error.
  
  Solution:
  
  
  Use Specific Table Types: Instead of using a generic table type, define and use a specific table type that matches the expected structure. For example, if you are working with a table of a specific structure, declare it as TABLE OF <specific_structure>.
  TYPES: BEGIN OF ty_example,
           field1 TYPE string,
           field2 TYPE i,
         END OF ty_example.
  TYPES: tt_example TYPE TABLE OF ty_example.
  
  
  Check Function Module/Method Signatures: Review the signatures of the function modules or methods you are calling. Ensure that the parameters you are passing match the expected types.
  
  
  Refactor Code: If you have existing code that uses generic types, consider refactoring it to use specific types. This may involve creating new types or structures that are more descriptive and tailored to your needs.
  
  
  Debugging: If you are unsure where the error is occurring, use the ABAP debugger to trace the execution and identify the exact line of code that triggers the error.
  
  
  Related Information:
  
  ABAP Data Types: Familiarize yourself with the different data types in ABAP, including structured types, table types, and generic types.
  Function Module Documentation: Review the documentation for any function modules or methods you are using to understand their parameter requirements.
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to this error message.
  
  By ensuring that you are using specific table types in your ABAP code, you can resolve the DO839 error and prevent it from occurring in the future.