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

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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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