Message type: E = Error
Message class: VW - Shipment Processing Output
Message number: 656
Message text: Select exactly one shipment
To execute this function, you need to select exactly one shipment
The system terminates the process.
Select a shipment document and carry out the process again.
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.