Message type: E = Error
Message class:  5W - Messages for PD (Particularly Workflow) 
Message number: 311
Message text: No agent has been chosen
No agent has been chosen from those offered for selection.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message 5W311: No agent has been chosen typically occurs in the context of SAP's workflow or process management, particularly when a task or work item is being processed, and the system cannot determine which agent (user or group) should be responsible for it.
Cause: Missing Agent Assignment: The workflow task does not have an agent assigned to it. This can happen if the task is not properly configured or if the agent determination logic fails. Incorrect Workflow Configuration: The workflow may not be set up correctly, leading to the inability to determine an appropriate agent. User or Role Issues: The user or role that should be assigned as an agent may not exist, or there may be issues with user authorizations. Dynamic Agent Determination Failure: If the workflow uses dynamic agent determination (e.g., based on certain conditions), and those conditions are not met, it may result in no agent being selected.
Solution: Check Workflow
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