Sale Order Line Cancel Sale Stock

This module extends the sale order line cancellation feature so that stock operations are handled correctly. When you cancel the remaining quantity on a confirmed sale order line, it first cancels the pending outgoing stock moves for that line, then updates the cancelled quantity on the line.

• It only cancels stock moves that are not yet done or cancelled, and only for lines whose delivered quantity is based on stock moves and that can have their remaining quantity cancelled.
• It prevents Odoo from recreating stock moves when the ordered quantity is reduced, because the moves are cancelled before the quantity change.
• It also tracks the cancelled quantity when a stock move is cancelled manually, but only if there are no other pending moves for that sale order line.
• When a backorder is cancelled during validation, the cancelled quantity on the sale order line is updated.

The module touches sale.order, sale.order.line and stock.move. It adds no new menus or screens; the behaviour is integrated into the existing cancel remaining quantity action on sale order lines and into stock move cancellation and validation flows.

Note: the code warns that using this module together with allowing ordered quantity changes on confirmed sale orders may lead to unpredictable results.