By default, the stockable products will not be allowed to have a negative
stock. If you want to make some exceptions for some products, product
categories or locations, you can activate the option *Allow Negative Stock*:

For products:

#. Go to *Inventory / Master Data / Products* and in the
   tab *General Information* activate this option.

For product categories:

#. Go to *Inventory / Configuration / Products / Product Categories*
   and activate this option.

For individual locations:

#. Go to *Inventory / Configuration / Settings* and activate
   the option *Storage Locations*.
#. Go to *Inventory / Configuration / Warehouse Management / Locations* and
   activate the option the option *Allow Negative Stock* for the locations you
   choose.
