check inventory

app/models/inventory_definition.rb

@@ -12,7 +12,7 @@ class InventoryDefinition < ApplicationRecord
   end
 
   def self.find_product_in_inventory(item)
-    product = InventoryDefinition.find_by_item_code(item.product_code)
+    product = InventoryDefinition.find_by_item_code(item.item_instance_code)
     if product.nil?
       return false, nil
     else
@@ -21,7 +21,7 @@ class InventoryDefinition < ApplicationRecord
   end
 
   def self.check_balance(item,inventory_definition) # item => saleItemOBj
-     stock = StockJournal.where('item_code=?', item.product_code).order('created_at desc').take
+     stock = StockJournal.where('item_code=?', item.item_instance_code).order('created_at desc').take
      unless stock.nil?
        modify_balance(item, stock, inventory_definition)
      else