Purchase units vs. stock units

You rarely buy things in the same unit you store them in. Ashicore keeps the two separate on every line and converts between them with one number — the purchase-to-stock factor — so ordering stays natural and inventory stays exact.

Two units, one item

An item can have a purchase unit (how you buy it) and always has a stocking unit (how you hold and consume it). If no purchase unit is set, purchase order lines use the stocking unit with a conversion factor of 1.

Term	What it means	Example
Purchase unit	The unit you order in	Bag
Stocking unit	The unit inventory is held in	kg
Purchase-to-stock factor	Stocking units per 1 purchase unit	69

The conversion

The factor drives everything. Quantities and cost are converted the moment a line is entered.

×

Quantity → stocking units

Stocking quantity = order quantity × factor. Ordering 12 bags at a factor of 69 books 828 kg of expected and, later, received stock.

÷

Cost → per stocking unit

The unit cost is the price of one purchase unit; dividing by the factor gives the base cost per stocking unit. $310 / bag ÷ 69 = $4.49 / kg before any landed costs.

The per-stock-unit cost is what inventory uses

That figure becomes the line’s landed cost per stock unit — the basis for lot cost, the item’s running cost, recipe roll-ups, and stocktakes. Add freight as a by-value cost and it climbs; see Landed cost.

Where each unit shows up

Uses purchase units	Uses stocking units
Order & receive quantities	Inventory on hand & lots
The unit cost you negotiate	Landed cost & valuation
The supplier-facing order & bill	Expected supply, recipe consumption, stocktakes

Units are snapshotted

When a line is saved, its order unit, stocking unit, and conversion factor are copied onto the line. If the item has no purchase unit, the order unit is the stock unit and the factor is 1. Changing an item’s units later won’t rewrite an untouched order, but editing and saving that order refreshes the copied unit details from the item — see Snapshots.