How To Fix APPLG238 - GP: There is no data source (name in DC) for this column of the tree

APPLG238 - Overview

• Message type: E = Error

• Message class: APPLG - Application Graphics Messages (Graphic Proxy Framework)

• Message number: 238

• Message text: GP: There is no data source (name in DC) for this column of the tree

What causes this issue?

This message is a warning that could indicate a programming error.
An item number was specified using the attribute ITEM_ORDER in point
customizing (CL_CU_POINT) without a variant key. However, no attribute
name in the data container was specified for this item number (method
SET_DC_NAMES in the graphics proxy).
The relevant column cannot be supplied with data so it is displayed
empty.

Error message extract from SAP system. Copyright SAP SE.

APPLG238 - Details

• The SAP error message APPLG238, which states "There is no data source (name in DC) for this column of the tree," typically occurs in the context of SAP applications that utilize tree structures, such as SAP GUI or SAP Fiori applications. This error indicates that the system is unable to find a data source for a specific column in a tree structure, which can prevent the application from displaying the required data.
  Causes:
  
  Missing Data Source Configuration: The data source for the specified column may not be properly configured in the Data Dictionary (DDIC) or the application configuration.
  Incorrect Data Source Name: The name of the data source specified in the application may be incorrect or misspelled.
  Transport Issues: If the application was recently transported from one system to another (e.g., from development to production), the data source may not have been included in the transport.
  Authorization Issues: The user may not have the necessary