How To Fix AXT_MODEL240 - UI Component &1 does not support nested tables

SAP Error Message - Details

• Message type: E = Error

• Message class: AXT_MODEL -

• Message number: 240

• Message text: UI Component &1 does not support nested tables

What causes this issue?

You have activated the table extensible flag for a table enhancement.
However the UI component &V1&, which has been set as container for the
generated views, does not meet a requirement to fully support child
tables.

System Response

A warning is raised. At runtime created child tables will not work
properly.

How to fix this error?

You can either create a new UI component from transaction AXTSYS and use
it, or you can adjust the UI component.
To adjust the component, you can do the following:
Open the UI component &V1& in the component workbench (Transaction
BSP_WD_CMPWB)
Open the component controller
Go to the controller implementation class
Go to the Properties tab and navigate to the superclass => Now the
superclass should be shown as CL_BSP_WD_COMPONENT_CONTROLLER
Switch to edit mode and click on Change Inheritance. It might be
necesarry to enter a description before.
Enter class CL_AXT_BASE_TABLE_UI_COMPONENT
If you are asked whether you want to keep redefined methods, choose yes
Go to Methods tab
Open Method WD_USAGE_INITIALIZE
Add the following lines to the beginning of the method, if they are not
there yet
super->wd_usage_initialize(
iv_usage = iv_usage
).
Activate the changes

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AXT_MODEL240 - UI Component &1 does not support nested tables ?

  The SAP error message AXT_MODEL240, which states "UI Component &1 does not support nested tables," typically occurs in the context of SAP Fiori or SAPUI5 applications when there is an attempt to use nested tables in a UI component that does not support this feature.
  Cause:
  
  Nested Tables: The error arises when a developer tries to implement a nested table structure (a table within a table) in a UI component that does not support this functionality. This can happen if the UI5 control being used does not allow for nested data binding or if the data model is not structured correctly to support such a layout.
  Incompatible UI Component: The specific UI component referenced in the error message may not be designed to handle nested data structures, leading to this error when the application tries to render the UI.
  
  Solution:
  
  Check UI Component Compatibility: Review the documentation for the UI component you are using to ensure it supports nested tables. If it does not, consider using a different component that can handle nested data structures.
  Flatten Data Structure: If nested tables are not supported, consider flattening the data structure. Instead of having a nested table, you can represent the data in a single table with additional columns to represent the nested data.
  Use Aggregation: If you need to display related data, consider using aggregation controls like sap.m.List or sap.m.Table with proper binding to represent the relationship without nesting.
  Custom Implementation: If the requirement is to display nested data, you may need to implement a custom solution using multiple UI components that can simulate the appearance of nested tables without actually nesting them.
  Review Data Binding: Ensure that the data binding is set up correctly. Sometimes, incorrect binding paths can lead to issues that manifest as this error.
  
  Related Information:
  
  SAPUI5 Documentation: Refer to the official SAPUI5 documentation for details on the specific UI components you are using and their capabilities regarding data binding and nested structures.
  SAP Community: Check the SAP Community forums for similar issues and solutions shared by other developers.
  Debugging Tools: Use browser developer tools to inspect the UI5 application and check for any additional errors or warnings that may provide more context about the issue.
  
  By following these steps, you should be able to resolve the AXT_MODEL240 error and implement a suitable solution for displaying your data in the SAP UI.