Stock Restrict Lot

This module brings back the idea of restricting a stock move to one specific lot or serial number. It is a base module, so most of its effect is visible only when other modules use the restriction, but the field and its behaviour are already in place.

Where it appears: - A "Restrict Lot" column is added to the move lists and the move kanban view, and to the Operations tab of the transfer form, visible only to users allowed to manage lots and serial numbers. - The transfer search view gets a "Lot" filter based on this restriction. - On the transfer itself the field is read-only and simply reflects the value of its moves.

Automatic behaviours: - When a move has a restricted lot, reservation and availability calculations only consider that lot, and only that lot is suggested when choosing which lots to take from an incoming move. - The lot is automatically filled on the generated move lines; if a different lot was reserved, an error is raised. - When the transfer is validated, Odoo checks that the lots actually moved match the restriction and blocks the validation otherwise. - The restriction is carried over to chained moves, to procurement values, to push rules and to return moves. - Moves with different restricted lots are not merged together. - Changing the restricted lot is refused if a move further down the chain is already done with another lot; otherwise the change is applied to the whole chain.

It touches stock.move, stock.picking, stock.rule and product quantity computations.