How To Fix DO013 - Associated type &: Reference types not allowed as associated types

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 013

• Message text: Associated type &: Reference types not allowed as associated types

What causes this issue?

INCLUDE DDDOC_TTYP_RANGE_CTYPE OBJECT DOKU ID TX
The associated type defined for the <DS:TX.DDDOC_TTYP_RANGETTYP>ranges
table type</> is not an elementary type. It is a
<DS:TX.DDDOC_REFTYPE>reference type</> or a data element with a
reference 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?

Enter an elementary associated type by defining a data element with an
elementary type as associated type or with direct type entry (directly
defining the data type, number of places and if necessary decimal
places).

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DO013 - Associated type &: Reference types not allowed as associated types ?

  The SAP error message DO013, which states "Associated type &: Reference types not allowed as associated types," typically occurs in ABAP when you are trying to define an associated type in a way that is not permitted by the language's rules. This error is related to the use of reference types in the context of associated types in ABAP.
  Cause:
  The error arises when you attempt to define an associated type (for example, in a generic class or interface) using a reference type (like a class or interface) instead of a value type (like a structure or a simple data type). In ABAP, associated types must be value types because they are intended to be used in contexts where the value is expected to be copied rather than referenced.
  Solution:
  To resolve this error, you need to ensure that the associated types you are defining are value types. Here are some steps you can take:
  
  
  Change the Type Definition: If you are using a reference type, consider changing it to a value type. For example, if you are using a class, you might want to use a structure or a simple data type instead.
  
  
  Use Value Types: Ensure that any associated types you define in your generic classes or interfaces are based on value types. This includes using structures, tables, or simple data types (like integers, strings, etc.).
  
  
  Review the Context: Check the context in which you are defining the associated type. Make sure that it aligns with the expected usage of associated types in ABAP.
  
  
  Example:
  Here’s a simple example to illustrate the issue:
  CLASS my_class DEFINITION.
    TYPES: BEGIN OF my_type,
             field1 TYPE i,
             field2 TYPE string,
           END OF my_type.
  
    TYPES: my_associated_type TYPE my_type. " This is valid
  
    TYPES: my_ref_associated_type TYPE REF TO my_class. " This will cause DO013 error
  ENDCLASS.
  In the above example, my_associated_type is valid because it is a value type, while my_ref_associated_type will trigger the DO013 error because it is a reference type.
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for more details on data types and associated types.
  SAP Community: You can find discussions and solutions related to this error on the SAP Community forums, where other developers may have encountered similar issues.
  ABAP Language Reference: The ABAP Language Reference Guide provides detailed information about data types, including value types and reference types.
  
  By ensuring that you are using value types for associated types, you should be able to resolve the DO013 error in your ABAP code.