[FIX] pos_sale: keep sale order references in pos restaurant

Before this commit, if the user tried to settle a sale order
in PoS restaurant, then went back to floor and then returned
to the table, the sale order reference will disappear.

The problem is that the `sale_order_origin_id` is not loaded.

opw-3550351

closes odoo/odoo#149262

X-original-commit: 13db10c1c73418ce4eabc52ef2415a1f27f1e24e
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>
Signed-off-by: Pedram Bi Ria (pebr) <pebr@odoo.com>

addons/pos_sale/models/pos_order.py

@@ -122,6 +122,28 @@ class PosOrder(models.Model):
 
         return inv_line_vals
 
+    def _get_fields_for_order_line(self):
+        fields = super(PosOrder, self)._get_fields_for_order_line()
+        fields.extend([
+            'sale_order_origin_id',
+            'down_payment_details',
+            'sale_order_line_id',
+        ])
+        return fields
+
+    def _prepare_order_line(self, order_line):
+        order_line = super()._prepare_order_line(order_line)
+        if order_line.get('sale_order_origin_id'):
+            order_line['sale_order_origin_id'] = {
+                'id': order_line['sale_order_origin_id'][0],
+                'name': order_line['sale_order_origin_id'][1],
+            }
+        if order_line.get('sale_order_line_id'):
+            order_line['sale_order_line_id'] = {
+                'id': order_line['sale_order_line_id'][0],
+            }
+        return order_line
+
 class PosOrderLine(models.Model):
     _inherit = 'pos.order.line'