Inventory app is a collection of extensible models and utilities
for inventory management:
    - record stock levels of all supplies in inventory locations
    - log and classify of all stock transactions that change stock levels
    - record details for all consignments of supplies to and from inventory locations
    - optionally link consignments to logistics (transport) information

DEPENDS ON:
Locations, Logistics (optionally)

Inventory is intended for use in conjunction with Logistics app, if necessary.
If you do not need the functionality of Logistics, you must comment out
lines ending with the following comment: #LOGISTICS