[IMP] point_of_sale: indicate on pos picking type the use of lots

By unticking the "Use Existing Lots" checkbox on the pos picking type,
you can choose not to enter any lots/serial numbers in the pos.  This
way, the picking will not specify the lots either and the system will
take the quants and lots according to the removal strategy.

addons/point_of_sale/models/pos_config.py

@@ -62,6 +62,7 @@ class PosConfig(models.Model):
         'pos_config_id', 'journal_id', string='Available Payment Methods',
         domain="[('journal_user', '=', True ), ('type', 'in', ['bank', 'cash'])]",)
     picking_type_id = fields.Many2one('stock.picking.type', string='Operation Type')
+    use_existing_lots = fields.Boolean(related='picking_type_id.use_existing_lots')
     stock_location_id = fields.Many2one(
         'stock.location', string='Stock Location',
         domain=[('usage', '=', 'internal')], required=True, default=_get_default_location)

addons/point_of_sale/models/pos_order.py

@@ -643,13 +643,17 @@ class PosOrder(models.Model):
         has_wrong_lots = False
         for order in self:
             for pack_operation in (picking or self.picking_id).pack_operation_ids:
+                picking_type = (picking or self.picking_id).picking_type_id
+                lots_necessary = True
+                if picking_type:
+                    lots_necessary = picking_type and picking_type.use_existing_lots
                 qty = 0
                 qty_done = 0
                 pack_lots = []
                 pos_pack_lots = PosPackOperationLot.search([('order_id', '=',  order.id), ('product_id', '=', pack_operation.product_id.id)])
                 pack_lot_names = [pos_pack.lot_name for pos_pack in pos_pack_lots]
 
-                if pack_lot_names:
+                if pack_lot_names and lots_necessary:
                     for lot_name in list(set(pack_lot_names)):
                         stock_production_lot = StockProductionLot.search([('name', '=', lot_name), ('product_id', '=', pack_operation.product_id.id)])
                         if stock_production_lot:
@@ -662,7 +666,7 @@ class PosOrder(models.Model):
                             pack_lots.append({'lot_id': stock_production_lot.id, 'qty': qty})
                         else:
                             has_wrong_lots = True
-                elif pack_operation.product_id.tracking == 'none':
+                elif pack_operation.product_id.tracking == 'none' or not lots_necessary:
                     qty_done = pack_operation.product_qty
                 else:
                     has_wrong_lots = True

addons/point_of_sale/static/src/js/models.js

@@ -1219,7 +1219,7 @@ exports.Orderline = Backbone.Model.extend({
         return orderline;
     },
     set_product_lot: function(product){
-        this.has_product_lot = product.tracking !== 'none';
+        this.has_product_lot = product.tracking !== 'none' && this.pos.config.use_existing_lots;
         this.pack_lot_lines  = this.has_product_lot && new PacklotlineCollection(null, {'order_line': this});
     },
     // sets a discount [0,100]%