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

SAP Error Message - Details

• 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

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Smart SAP Assistant

• What is the cause and solution for SAP error message FL390 - Navigation is not supported for ABAP internal types ?

  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, the configuration of the application or the way the data is being fetched or displayed can lead to this error.
  
  Solution:
  
  Check Data Types: Review the ABAP code or the data model to ensure that you are not trying to navigate to unsupported internal types. If you need to display data, consider converting it to a supported format (like a simple structure or a flat table).
  Modify the Code: If you are a developer, modify the ABAP code to ensure that only supported data types are used for navigation. You may need to create views or use other methods to present the data in a user-friendly way.
  Use Supported Interfaces: Ensure that you are using the correct interfaces or APIs that support the data types you are working with. For example, if you are using Fiori, make sure that the OData services are correctly defined and that they return data in a format that can be navigated.
  Debugging: If you have access to the development environment, use debugging tools to trace where the error is occurring and identify the specific data type causing the issue.
  Consult Documentation: Refer to SAP documentation or community forums for guidance on handling specific data types and navigation issues.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error. Sometimes, there are specific fixes or workarounds provided by SAP.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Training and Documentation: If you are new to SAP development or configuration, consider reviewing training materials or documentation related to ABAP programming and SAP UI technologies.
  
  By addressing the underlying cause of the error and ensuring that you are working with supported data types, you should be able to resolve the FL390 error effectively.