Scrap Production Lot

When you open a Lot or Serial Number record, a Scrap button now appears in the form header. It is hidden when the lot has no quantity on hand.

Clicking it asks for confirmation, then looks at all the lot's quants (the actual stock quantities) that are in internal locations and have a positive quantity. If none are found, Odoo shows an error saying the lot contains no quant in an internal location.

For each of those quants, a scrap record is created automatically, taking the lot, product, unit of measure, quantity, source location and package from the quant, and using the lot name as the origin. You are then taken to the Scrap screen: if several scraps were created, the list is filtered to show only them; if there was just one, its form opens directly.

When a scrap that is linked to a lot is validated, a message is posted on the lot's chatter saying the lot was scrapped by the current user.

The module touches the Lot/Serial Number model (stock.lot) and the Scrap model (stock.scrap). It does not add new menus; the button lives on the existing lot form and results open the standard Scrap views.