Stock available to promise

This module gives every product two new computed quantities: "Available to promise" (the stock that can safely be proposed for sale to customers) and "Potential" (the quantity that could be produced from materials already at hand).

Where it appears: - On the product form (both product and product variant), two new stat buttons labelled "Available" and "Potential" are added next to the forecast button; clicking them opens the stock quantities screen. They are hidden for products that are not storable. - In the product list views, a new "Available to promise" column is added after the forecasted quantity; it is shown in red when negative and is visible to inventory users. - On the product kanban card, an "Available to Promise" line is displayed when the on-hand quantity status is shown.

How the values are calculated: - For a single product variant, "Available to promise" starts as the forecasted quantity and "Potential" is zero. Other modules can extend these calculations. - For a product template with several variants, the available quantity is the sum over variants of (available minus potential), plus the largest potential among the variants; the template's potential is that largest variant potential. - The values react to the forecasted quantity and to context such as lot, owner, package, dates, location, warehouse and allowed companies.

Users can also search products by "Available to promise" using comparison operators. The module only adds these fields and views; it does not create menus or scheduled actions.