How To Fix WD085 - XML persistence must be set up when using blocks

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 085

• Message text: XML persistence must be set up when using blocks

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• What is the cause and solution for SAP error message WD085 - XML persistence must be set up when using blocks ?

  SAP Error Message:
  
  WD085 - XML persistence must be set up when using blocks
  
  Cause:
  This error occurs in Web Dynpro applications when you use blocks (UI elements that group other UI elements) but have not properly configured XML persistence for the component or view. 
  In Web Dynpro, XML persistence is a mechanism that stores the state of UI elements (like input fields, blocks, etc.) between requests. When blocks are used, the framework expects XML persistence to be enabled to maintain the state of these blocks across round-trips. If XML persistence is not set up, the framework cannot serialize/deserialize the UI state, leading to this error.
  
  Explanation:
  
  Blocks are container UI elements that can hold other UI elements.
  When blocks are used, the Web Dynpro runtime requires XML persistence to be enabled to save and restore the UI state.
  If XML persistence is not enabled, the runtime throws the WD085 error.
  
  
  Solution:
  
  
  Enable XML Persistence for the View or Component:
  
  Open the Web Dynpro component or view in the Web Dynpro Explorer.
  Go to the Properties of the view or component where the block is used.
  Find the property "XML Persistence".
  Set XML Persistence = TRUE.
  
  
  
  Check the Component Configuration:
  
  Sometimes XML persistence needs to be enabled at the component level as well.
  Ensure that the component's XML persistence is enabled if the view inherits this setting.
  
  
  
  Regenerate and Activate:
  
  After enabling XML persistence, regenerate and activate the component/view.
  Test the application again.
  
  
  
  
  Additional Information:
  
  XML persistence is essential for complex UI elements that maintain state, such as blocks, tables, and custom controls.
  Without XML persistence, the Web Dynpro framework cannot maintain the UI state between requests, which is critical for user interaction.
  Enabling XML persistence may slightly increase the memory footprint because the UI state is serialized into XML.
  This setting is generally recommended when using blocks or other complex UI elements.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WD085 - XML persistence must be set up when using blocks
  
  
  Cause
  Blocks used without enabling XML persistence
  
  
  Solution
  Enable XML persistence in the view/component properties
  
  
  Where to set
  View or Component properties ? XML Persistence = TRUE
  
  
  Effect
  Allows Web Dynpro to maintain UI state across requests
  
  
  
  
  If you follow these steps, the error WD085 should be resolved, and your Web Dynpro application will correctly handle blocks with XML persistence enabled.