Sometimes when you create one purchase order or warehouse transfer in Inventory Planner and sync the information to your Amazon Seller Central account, you may find that there are two shipment plans created. This single PO or transfer has been split by Amazon (with the information reflecting in Inventory Planner). 

To learn more about why this happens, see this Amazon seller forum.

This can sometimes be addressed in Inventory Planner by setting your UOM (units of measure).

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