Inventory - Allow Negative Stock On Hand
Ability to allow negative stock in Xero.
Purpose: Users that take orders and receive payments from their contacts before placing inventory can easily do it in Xero.

Hi everyone, we appreciate the restrictive nature of inventory(Products and Services) atm, and our product team have plans to explore adding capability to cater for negative inventory or back order of stock recorded in Xero.
While they have a few other priorities to get through first we'll move this idea to Under review and return to share more when this work picks up.
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AdminXero Team (Admin, Xero) commented
Ability to sell an item below Zero when using tracked inventory
Purpose: Users can send an invoice to their customers when it’s 0 or below. So they can secure the deposit from the customer.