How To Fix 37420 - There is already a Control Composite for Custom Control &1

SAP Error Message - Details

• Message type: E = Error

• Message class: 37 - Screen Painter

• Message number: 420

• Message text: There is already a Control Composite for Custom Control &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message 37420 - There is already a Control Composite for Custom Control &1 ?

  The SAP error message "37420: There is already a Control Composite for Custom Control &1" typically occurs in the context of SAP UI5 or SAP Fiori applications when there is an attempt to create or instantiate a control composite that has already been created. This can happen due to various reasons, such as duplicate initialization of a control or incorrect handling of the lifecycle of UI components.
  Cause:
  
  Duplicate Initialization: The error often arises when the same control is being initialized multiple times in the application, leading to conflicts.
  Improper Lifecycle Management: If the control is not properly destroyed or cleaned up before being re-initialized, it can lead to this error.
  Code Logic Issues: There may be logical errors in the code that lead to the creation of the same control multiple times.
  
  Solution:
  
  Check Initialization Logic: Review the code to ensure that the control is only being initialized once. Use flags or checks to prevent multiple initializations.
  Destroy Existing Controls: Before creating a new instance of the control, ensure that any existing instance is properly destroyed. You can use the destroy() method to clean up the control.
  Use Singleton Pattern: If applicable, consider implementing a singleton pattern for the control to ensure that only one instance exists at any time.
  Debugging: Use debugging tools to trace the execution flow and identify where the control is being instantiated multiple times.
  Review Event Handlers: Ensure that event handlers are not causing the control to be created multiple times inadvertently.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for UI5/Fiori for best practices on control management and lifecycle.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and how they resolved them.
  Code Review: Conduct a thorough review of the codebase to identify any patterns or practices that may lead to this error.
  
  By following these steps, you should be able to resolve the error and prevent it from occurring in the future.