Shipment Preview Calls and how they influence the way shipments are split

When you add items to shipment in SellerEngine Plus the software sends a shipment preview call to Amazon and Amazon responds with their desired location for each item. In other words, Amazon is telling SellerEngine Plus where the items need to be sent, and the software creates a shipment for every warehouse location and label type combination provided by Amazon.

Only if all items added need to be sent to the same warehouse with the same label type will they all be added to the same shipment.