[FIX] stock: put in pack and unreserve

- Create a product P, tracked by lot
- Add some stock with a lot
- Create an outgoing picking
- Set 10 units of P
- Set 2 done, Put in Pack
- Unreserve

An error occurs: 'It is not possible to unreserve more products of P
than you have in stock.'

It happens because the `lot_id` is removed from the copied
`stock.move.line`.

Commit eac8c06 makes sense for incoming pickings, but
not for internal or outgoing transfers.

opw-2288208

X-original-commit: ed738fb

addons/stock/models/stock_picking.py

@@ -1248,10 +1248,11 @@ def _put_in_pack(self, move_line_ids):
                     new_move_line = ml.copy(
                         default={'product_uom_qty': 0, 'qty_done': ml.qty_done})
                     vals = {'product_uom_qty': quantity_left_todo, 'qty_done': 0.0}
-                    if ml.lot_id:
-                        vals['lot_id'] = False
-                    if ml.lot_name:
-                        vals['lot_name'] = False
+                    if pick.picking_type_id.code == 'incoming':
+                        if ml.lot_id:
+                            vals['lot_id'] = False
+                        if ml.lot_name:
+                            vals['lot_name'] = False
                     ml.write(vals)
                     new_move_line.write({'product_uom_qty': done_to_keep})
                     move_lines_to_pack |= new_move_line