FIX After refund of 1 qty, POS qty display increased by 2 qty

pos_stock_available_online/models/__init__.py

@@ -3,3 +3,4 @@
 from . import res_config_settings
 from . import stock_quant
 from . import stock_warehouse
+from . import pos_order

pos_stock_available_online/models/pos_order.py

@@ -0,0 +1,24 @@
+from odoo import api, fields, models, _
+
+
+class PosOrder(models.Model):
+    _inherit = 'pos.order'
+
+    @api.model
+    def create_from_ui(self, orders, draft=False):
+        order_ids = super(PosOrder, self).create_from_ui(orders, draft)
+        for order in self.sudo().browse([o['id'] for o in order_ids]):
+            config = order.config_id
+            # send quantity notification after order
+            if config and config.display_product_quantity:
+                products = order.lines.mapped("product_id")
+                warehouse_info = []
+                for product in products:
+                    # prepared first main warehouse info
+                    warehouse_info = [config.main_warehouse_id._prepare_vals_for_pos(product)]
+                    # prepared additional warehouses info
+                    for warehouse in config.additional_warehouse_ids:
+                        warehouse_info.append(warehouse._prepare_vals_for_pos(product))
+                if warehouse_info:
+                    config._notify_available_quantity(warehouse_info)
+        return order_ids