How To Fix WD228 - Select one node only

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 228

• Message text: Select one node only

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WD228 - Select one node only ?

  Certainly! Here's a detailed explanation for the SAP error message WD228 - "Select one node only":
  
  SAP Error Message: WD228 - Select one node only
  
  Cause:
  This error occurs in the Web Dynpro ABAP environment when a user or a program tries to perform an action that requires exactly one node (element) to be selected in a UI element such as a tree, table, or list, but either:
  
  No node is selected, or
  More than one node is selected.
  
  The message enforces that the operation can only be performed when a single node is selected.
  
  When does it typically occur?
  
  When a user tries to execute an action (e.g., edit, delete, display details) that logically applies to a single item but the selection is empty or multiple items are selected.
  In custom Web Dynpro applications where node selection is mandatory for further processing.
  In standard SAP Web Dynpro applications with tree or table controls that require single selection mode.
  
  
  Solution:
  
  
  User Action:
  
  Ensure that exactly one node (item) is selected before triggering the action.
  If multiple nodes are selected, deselect all but one.
  If no node is selected, select one node.
  
  
  
  Developer Action:
  
  
  Check the UI element's selection mode:
  
  For example, in Web Dynpro, ensure the UI element (e.g., WDDOINIT method or event handler) enforces single selection mode if the business logic requires it.
  
  
  
  Add validation logic before processing the action to check the number of selected nodes.
  
  
  Provide user-friendly messages or disable action buttons when no or multiple selections are made.
  
  
  Example code snippet to check selection count:
  DATA: lt_selected_nodes TYPE wdy_t_node_key,
        lv_count TYPE i.
  
  lt_selected_nodes = wd_context->get_selected_nodes( ).
  lv_count = lines( lt_selected_nodes ).
  
  IF lv_count <> 1.
    MESSAGE e228(00) WITH 'Select one node only'.
  ENDIF.
  
  
  
  
  UI Configuration:
  
  Set the selection mode of the UI element to single selection if the business process requires only one node to be selected.
  This can be done in the Web Dynpro component's layout or properties.
  
  
  
  
  Related Information:
  
  Message Class: WD (Web Dynpro)
  Message Number: 228
  Message Text: Select one node only
  SAP Notes: Check for any SAP Notes related to Web Dynpro UI controls and selection behavior if this error appears unexpectedly.
  Web Dynpro Concepts: Understanding node selection, context nodes, and UI element properties is essential.
  Transaction: This message is typically seen in Web Dynpro applications, not in classic SAP GUI transactions.
  
  
  Summary:
  
  Cause: Action requires exactly one node selected; user selected none or multiple.
  Solution: Select exactly one node before proceeding; developers should enforce and validate single selection.
  Context: Web Dynpro ABAP UI elements like trees or tables.
  
  
  If you need help with a specific scenario or code snippet related to this error, feel free to ask!