This module performs two checks during checkout.
When a user tries to add a product to cart, the quantity is checked against the available stock level.
If the quantity exceeds stock level, the user won't be able to add the product to the cart.
Instead an error message tells him to chose a different quantity.
The same check is performed when the user updates his cart.
- Product kits not supported yet. (will fix)
- Differing SKUs not supported yet, just checks the standard SKU. (will fix)