Minor Description
In Shipment services, the service of creation, called createShipment, don't accept our own shipmentId. It can be a problem in some business, and I think it won't be difficult to add a IN parameter shipmentId.
So, I propose to change the service and use a shipmentId given by default, and if there is no shipmentId in parameters, it will get the next sequenced id (as it already done in the createShipment service).
