How To Fix DT173 - Field &: Basis type &: Reference only allowed to class &

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 173

• Message text: Field &: Basis type &: Reference only allowed to 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 DT173 - Field &: Basis type &: Reference only allowed to class & ?

  The SAP error message DT173 indicates that there is an issue with the data type definition in ABAP (Advanced Business Application Programming). Specifically, it suggests that a field is being defined with a reference to a class type, but the context in which it is being used does not allow for that reference.
  Cause:
  The error typically arises in the following scenarios:
  
  Incorrect Data Type Assignment: You are trying to assign a reference type (like a class) to a field that is not defined to hold a reference. This can happen if you are trying to use a class reference in a structure or table where a value type is expected.
  Field Definition Issues: The field in question may be defined in a way that does not support reference types, such as in a database table or a structure that is not designed to hold object references.
  
  Solution:
  To resolve the DT173 error, consider the following steps:
  
  
  Check Field Definition: Review the definition of the field that is causing the error. Ensure that it is defined as a reference type if you intend to use it to hold a reference to a class instance.
  
  If the field is part of a structure or table, you may need to change its type to a reference type (e.g., REF TO <class_name>).
  
  
  
  Modify Data Structure: If the field is part of a database table or a structure that cannot hold references, you may need to redesign your data model. This could involve:
  
  Creating a new structure that can hold references.
  Using value types instead of reference types if appropriate for your use case.
  
  
  
  Check Context of Usage: Ensure that the context in which you are using the field allows for reference types. For example, if you are trying to use it in a context that expects a value type, you will need to adjust your code accordingly.
  
  
  Review Class Definition: Make sure that the class you are referencing is correctly defined and accessible in the context where you are trying to use it.
  
  
  Related Information:
  
  ABAP Data Types: Familiarize yourself with the different data types in ABAP, especially the distinction between value types and reference types.
  SAP Documentation: Refer to the official SAP documentation for more details on data type definitions and best practices in ABAP programming.
  Debugging: Use the ABAP debugger to trace the execution and identify where the error occurs, which can provide additional context for resolving the issue.
  
  By following these steps, you should be able to identify the root cause of the DT173 error and implement a suitable solution.