Check your restock limits monitor on the Inventory performance or Shipping Queue page in Seller Central. You’ll see your maximum shipment quantity for each storage type. You can restock ASINs based on your choice as long as you don’t exceed the maximum shipment quantity for each storage type.
Amazon uses your maximum inventory level minus utilization to calculate your maximum shipping quantity. Utilization includes your current FBA inventory and all incoming shipments. Inventory pending removals and reserved inventory are not included in the calculation. Customer returns are also included in your overall inventory count. You can see your utilization number by storage type in your restock limits monitor.