move to abstract model

InvenTree/order/models.py

@@ -151,6 +151,23 @@ class Order(ReferenceIndexingMixin):
 
     notes = MarkdownxField(blank=True, verbose_name=_('Notes'), help_text=_('Order notes'))
 
+    def get_total_price(self):
+        """
+        Calculates the total price of all order lines
+        """
+        target_currency = currency_code_default()
+        total = Money(0, target_currency)
+
+        # order items
+        total += sum([a.quantity * convert_money(a.sale_price, target_currency) for a in self.lines.all() if a.sale_price])
+
+        # additional lines
+        total += sum([a.quantity * convert_money(a.sale_price, target_currency) for a in self.additional_lines.all() if a.sale_price])
+
+        # set decimal-places
+        total.decimal_places = 4
+        return total
+
 
 class PurchaseOrder(Order):
     """ A PurchaseOrder represents goods shipped inwards from an external supplier.
@@ -601,23 +618,6 @@ class SalesOrder(Order):
         verbose_name=_('shipped by')
     )
 
-    def get_total_price(self):
-        """
-        Calculates the total price of all order lines
-        """
-        target_currency = currency_code_default()
-        total = Money(0, target_currency)
-
-        # order items
-        total += sum([a.quantity * convert_money(a.sale_price, target_currency) for a in self.lines.all() if a.sale_price])
-
-        # additional lines
-        total += sum([a.quantity * convert_money(a.sale_price, target_currency) for a in self.additional_lines.all() if a.sale_price])
-
-        # set decimal-places
-        total.decimal_places = 4
-        return total
-
     @property
     def is_overdue(self):
         """