diff --git a/sale_copy.diff b/sale_copy.diff
new file mode 100644
index 0000000..9561c84
--- /dev/null
+++ b/sale_copy.diff
@@ -0,0 +1,13 @@
+diff -r 7fdc432c6f03 trytond/trytond/modules/sale/sale.py
+--- a/trytond/trytond/modules/sale/sale.py	Mon May 06 15:10:35 2019 +0200
++++ b/trytond/trytond/modules/sale/sale.py	Tue Jul 23 16:27:52 2019 +0200
+@@ -656,6 +656,9 @@
+         default.setdefault('moves', None)
+         default.setdefault('shipment_state', 'none')
+         default.setdefault('sale_date', None)
++        default.setdefault('untaxed_amount_cache', None)
++        default.setdefault('tax_amount_cache', None)
++        default.setdefault('total_amount_cache', None)
+         return super(Sale, cls).copy(sales, default=default)
+
+     def check_for_quotation(self):
diff --git a/series b/series
index 9e1cd66..3e0f304 100644
--- a/series
+++ b/series
@@ -20,6 +20,7 @@ analitic_line_company_rules.diff # [analytic_account] Not selected root accounts
 sale_list_price.diff # [sale] Can't convert to currency with list price is null (multicompany)
 sale_supply_supply_on_sale_multivalue.diff # [sale_supply] supply_on_sale field multvalue #035100
 sale_remove_multiselection.diff # [sale] remove multiselection handling exceptions
+sale_copy.diff # [sale] set _cache fields to null when copy
 
 purchase_remove_multiselection.diff # [purchase] remove multiselection handling exceptions