It is on this page, Remove inventory from a fulfillment center

Removal order cancellation

We may cancel a removal order if the inventory isn’t available for removal. For example, it may be part of a pending customer order.

Note: Canceled units are not removed from your inventory, so no units would be added back. If you feel that the units are missing, reconcile your inventory using fulfillment reports.

If we cancel a removal order, submit another request. The reasons to cancel can be specific to the related product. If we cancel the second request, contact Selling Partner Support.

If you would like to cancel a removal order that you submitted, go to Remove inventory from a fulfillment center.

– Remove inventory (overview)