SAP Message VW663 - Split not possible for shipment &1, deliveries &2

Diagnosis
Splitting the selected deliveries is not possible since the shipment<(>&<)>V1<(>&<)> with the selected deliveries <(>&<)>V2<(>&<)> islinked to a transportation chain. However, a shipment cost documentalready exists for the shipment.

System Response
The split cannot be executed for the selected deliveries.

Procedure
Revoke the selection for the deliveries <(>&<)>V2<(>&<)> or delete theshipment cost document for shipment <(>&<)>V1<(>&<)> and restart thesplitting process.