Purchase - Total Ordered Qty

This module extends the purchase order screen so buyers can see, at a glance, how much has been ordered in total, even when the order lines use different units of measure.

On the purchase order form, right below the order lines, a new 'Total Quantity' section appears. It lists one line per unit of measure, showing the quantity converted into that unit's reference unit, sorted by unit name. The section stays hidden while the order has no lines.

The totals are recalculated automatically whenever the ordered quantities or the units of measure on the order lines change. Quantities are first converted into the reference unit of their unit-of-measure category, then summed per unit, so lines using different units of the same category are combined correctly. The displayed text is translated according to the language of the user viewing the order.

The module only touches the purchase order model (purchase.order) and its form view; it does not change prices, taxes, stock, or any other document. No new menus, buttons, reports, or scheduled actions are added.