Product and variation rules

How inheritance works

Rules are resolved per field, not per product. For each of min, max, step and default the most specific value wins:

Resolution order

variation  →  product  →  role (Pro)  →  category (Pro)  →  store default

A blank field means inherit. So a product with only min = 4 filled keeps the store’s step and maximum.

Setting a product rule

Edit the product and open the Quantity & Pricing tab.

Tick Enable quantity rule for this item.

Fill only the fields you want to override. 0 in min or max means “no limit” (different from blank, which means “inherit”).

Quantity input mode — Free number field (default) or Only specific values (dropdown) (Pro) with Allowed values such as 12, 24, 48.

Update the product.

Variations

Each variation has the same fields inside its own panel. Leave them blank to inherit the parent product’s rule. On the front end the field, its limits and the hint switch the moment a variation is selected.

Info: Limits are checked per line: a variable product’s maximum applies to each variation separately (6 of size M and 6 of size L are both fine with a max of 10). The quantity already in the cart is always counted — adding 4 when 8 are already there is refused with a max of 10.

Stock

The effective maximum is always the lower of your rule and the available stock. If stock drops below the minimum, the product shows the “stock below minimum” message instead of a broken field.

Sold individually

WooCommerce’s Sold individually flag normally forces quantity 1. When a rule needs a real quantity field the plugin overrides the flag; use the qmtp_override_sold_individually filter to keep WooCommerce’s behaviour.