How To Fix FL390 - Navigation is not supported for ABAP internal types

FL390 - Overview

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 390

• Message text: Navigation is not supported for ABAP internal types

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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FL390 - Details

• The SAP error message FL390, which states "Navigation is not supported for ABAP internal types," typically occurs when you are trying to navigate or perform certain operations on data types that are not supported for navigation in the SAP GUI or in the context of the application you are using. This often happens in the context of using the SAP Fiori interface or when working with certain ABAP data types that do not have a corresponding representation in the user interface.
  
  Cause:
  
  Unsupported Data Types: The error is primarily caused by attempting to navigate to or display ABAP internal types (like structures, tables, or other complex data types) that do not have a direct representation in the user interface.
  Incorrect Data Handling: If the application is trying to handle data in a way that is not supported by the underlying data model or the user interface framework, this error can occur.
  
  Configuration Issues: Sometimes,