How To Fix W/202 - Error when calling a tree control method

SAP Error Message - Details

• Message type: E = Error

• Message class: W/ -

• Message number: 202

• Message text: Error when calling a tree control method

Self-Explanatory Message

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• What is the cause and solution for SAP error message W/202 - Error when calling a tree control method ?

  SAP Error Message:
  
  W/202 Error when calling a tree control method
  
  Cause
  This warning message typically occurs when there is an issue with the usage of a Tree Control method in ABAP, especially in classical Dynpro programming or when using the SAP GUI controls in custom programs or modules.
  Common causes include:
  
  Incorrect parameters passed to the tree control method.
  The tree control object is not properly instantiated or initialized before calling the method.
  The method is called at an inappropriate time, e.g., before the tree control is fully created or after it has been destroyed.
  Trying to manipulate nodes that do not exist or have been deleted.
  Using obsolete or unsupported methods for the tree control.
  The control handle is invalid or the control is not available in the current context.
  
  
  Explanation
  
  The message W/202 is a warning, not an error, indicating that the method call did not execute as expected.
  The tree control is a UI element that displays hierarchical data.
  Methods on the tree control include adding nodes, deleting nodes, expanding/collapsing nodes, etc.
  If the method call fails, the tree control may not update correctly, or the UI may behave unexpectedly.
  
  
  Solution
  
  
  Check Initialization:
  
  Ensure the tree control is properly created and initialized before calling any methods.
  For example, in classical dynpro, the tree control is usually created in the PBO (Process Before Output) module.
  
  
  
  Validate Parameters:
  
  Verify that all parameters passed to the method are correct and valid.
  For example, node handles or keys must exist.
  
  
  
  Check Method Timing:
  
  Call tree control methods at appropriate times in the program flow.
  Avoid calling methods before the control is ready or after it is destroyed.
  
  
  
  Use Correct Methods:
  
  Refer to SAP documentation for the correct and supported methods for the tree control.
  Avoid deprecated methods.
  
  
  
  Error Handling:
  
  Implement error handling to catch and log issues when calling tree control methods.
  Use TRY...ENDTRY blocks if available.
  
  
  
  Debugging:
  
  Use the debugger to check the state of the tree control object and parameters at the time of the method call.
  Check if the control handle is valid.
  
  
  
  SAP Notes and Documentation:
  
  Search for relevant SAP Notes that might address known issues with tree control methods.
  Review SAP Help Portal documentation on the tree control.
  
  
  
  
  Related Information
  
  SAP GUI Controls: Tree control is part of the SAP GUI controls used in classical dynpro programming.
  ABAP Documentation: Look for CL_GUI_TREE_CONTROL class and its methods.
  SAP Notes: Sometimes, specific SAP Notes address bugs or provide patches related to tree control issues.
  Common Methods:
  
  ADD_NODE
  DELETE_NODE
  EXPAND_NODE
  COLLAPSE_NODE
  
  
  Example:
  
  DATA: tree TYPE REF TO cl_gui_tree_control.
  
  CREATE OBJECT tree
    EXPORTING
      container_name = 'CONTAINER'.
  
  CALL METHOD tree->add_node
    EXPORTING
      parent_key = 'ROOT'
      key        = 'NODE1'
      text       = 'Node 1'.
  If add_node fails, you might get the warning W/202.
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Incorrect usage or timing of tree control method calls, invalid parameters, uninitialized control
  
  
  Solution
  Ensure proper initialization, validate parameters, call methods at correct time, use supported methods, debug and check SAP Notes
  
  
  Related
  CL_GUI_TREE_CONTROL class, SAP GUI controls, SAP Notes, ABAP debugger, SAP Help Portal
  
  
  
  
  If you provide the exact code snippet or context where the error occurs, I can help you diagnose the issue more precisely.