Stock Lot On Hand First

This module helps warehouse users choose the right lot when recording stock moves. It adds a new setting called "Display lots on hand first" on each Operation Type (for example Receipts, Delivery Orders, Internal Transfers). The setting only appears when the operation type already uses existing lots.

When the setting is turned on, the lot selection field in the Detailed Operations screen of a transfer lists lots that still have a quantity on hand first, and lots with no stock left at the end. This makes it faster to pick a lot that is actually available.

The option is stored on the operation type and automatically follows through to the related transfers and move lines, so users do not have to set it again on each document. If the operation type stops using existing lots, the option is automatically switched off.

The module touches the stock models stock.picking.type, stock.picking, stock.move, stock.move.line and stock.lot. It changes the lot search behaviour only when the option is active; otherwise lot selection works as usual.