How To Fix OO257 - Attribute &1 &2: Incorrect typing category: Reference obj. not embeddable

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 257

• Message text: Attribute &1 &2: Incorrect typing category: Reference obj. not embeddable

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO257 - Attribute &1 &2: Incorrect typing category: Reference obj. not embeddable ?

  The SAP error message OO257, which states "Attribute &1 &2: Incorrect typing category: Reference obj. not embeddable," typically occurs in the context of ABAP Object-Oriented programming. This error indicates that there is an issue with the definition of an attribute in a class or interface, specifically related to the type of the attribute being defined.
  Cause:
  The error is caused by attempting to define an attribute of a class or interface with a reference type that is not embeddable. In ABAP, certain types of reference objects (like classes) cannot be embedded directly into other classes or structures. This usually happens when:
  
  You are trying to define an attribute of a reference type (like a class reference) in a way that is not allowed.
  The reference type is not compatible with the expected type for the attribute.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Attribute Definition: Review the definition of the attribute that is causing the error. Ensure that the type you are using is appropriate for the context. If you are using a reference type, ensure that it is defined correctly.
  
  
  Use a Compatible Type: If the attribute is meant to hold a reference to an object, ensure that the type is compatible with the expected usage. For example, if you are trying to embed a reference type, consider using a value type or a different structure that allows for embedding.
  
  
  Change the Typing Category: If the attribute is defined as a reference type but should be a value type, change the definition accordingly. For example, if you are using a class reference, consider whether you can use a structure or a simple data type instead.
  
  
  Review Class Hierarchies: If the attribute is part of a class hierarchy, ensure that the base class or interface is defined correctly and that the derived classes are compatible.
  
  
  Consult Documentation: If you are unsure about the types and their compatibility, refer to the SAP documentation or ABAP programming guidelines for more information on data types and their usage.
  
  
  Related Information:
  
  ABAP Data Types: Familiarize yourself with the different data types in ABAP, including value types, reference types, and their characteristics.
  Object-Oriented Programming in ABAP: Understanding the principles of object-oriented programming in ABAP can help you design your classes and interfaces more effectively.
  SAP Community and Forums: If you continue to face issues, consider reaching out to the SAP community or forums where experienced developers can provide insights and solutions.
  
  By following these steps, you should be able to identify the root cause of the OO257 error and implement a suitable solution.