How To Fix WD518 - Choose one agent only

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 518

• Message text: Choose one agent only

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WD518 - Choose one agent only ?

  SAP Error Message:
  
  WD518 - Choose one agent only
  
  Cause:
  This error occurs in SAP Web Dynpro applications when a user tries to select or assign multiple agents (users or roles) in a context where only a single agent is allowed. The message "Choose one agent only" indicates that the system expects exactly one agent to be selected, but the user has selected none or more than one.
  This typically happens in scenarios involving workflow tasks, inbox processing, or agent assignment where the business logic or UI control restricts the selection to a single agent.
  
  When does it occur?
  
  When assigning a task to an agent in a workflow inbox.
  When selecting an agent in a Web Dynpro component that requires a single selection.
  When the UI element (e.g., dropdown, radio button, or selection list) is configured to allow only one agent, but multiple selections are made.
  
  
  Solution:
  
  
  Select exactly one agent:
  
  Ensure that the user selects only one agent before proceeding. If multiple agents are selected, deselect all but one.
  
  
  Check UI controls:
  
  Verify that the UI element used for agent selection is configured to allow only single selection (e.g., radio buttons or single-select dropdown).
  
  
  Adjust the code or configuration if multiple agents are needed:  
  
  If the business requirement allows multiple agents, modify the UI and backend logic to support multiple selections.
  Otherwise, enforce single selection strictly.
  
  
  
  Check the context binding and data:
  
  Sometimes, the error can occur if the context node or attribute that holds the agent selection is incorrectly bound or contains multiple entries. Correct the context binding to ensure only one agent is passed.
  
  
  Review workflow or Web Dynpro component settings:
  
  If this error occurs in a workflow inbox, check the task definition and agent assignment rules to ensure they expect a single agent.
  
  
  
  Related Information:
  
  Message Class: WD (Web Dynpro)
  Message Number: 518
  SAP Notes: Search SAP Support Portal for message WD518 for any specific notes or patches.
  Transaction Codes:  
  
  /IWNGW/WD (Web Dynpro ABAP) for debugging Web Dynpro applications.  
  SWI1 or SWIA for workflow inbox and task monitoring.
  
  
  
  
  Summary:
  
  Cause: Multiple agents selected where only one is allowed.
  Solution: Select exactly one agent; adjust UI or backend logic if multiple agents are needed.
  Check: UI controls, context binding, workflow task definitions.
  
  
  If you provide the exact scenario or transaction where this error occurs, I can help with more specific guidance.