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Qty need to pick = Assigned Qty - Prepare Ship Allocated Qty - Backordered Qty.
Prepare Ship Allocated Qty: Qty of items have been put into the fulfillment process.
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After the picking request is created successfully, a toast message will show “You have created a picking request successfully!”.
After you have created picking requests, you can continue the fulfillment process with the next step: Picking.
{How to manage your picking request}