diff --git a/message.xml b/message.xml
index 44ce6f3..2e751d2 100644
--- a/message.xml
+++ b/message.xml
@@ -16,7 +16,7 @@ this repository contains the full copyright notices and license terms. -->
             <field name="text">Party %(party)s has no any account receivable defined. Please, assign one.</field>
         </record>
         <record model="ir.message" id="open_statement">
-            <field name="text">Statement %(journal)s opened.</field>
+            <field name="text">Statement %(statement)s opened.</field>
         </record>
         <record model="ir.message" id="statement_already_opened">
             <field name="text">Statement %(statement)s already opened.</field>
diff --git a/sale.py b/sale.py
index 9e8cbd2..7e1a94f 100644
--- a/sale.py
+++ b/sale.py
@@ -69,13 +69,15 @@ class Sale(metaclass=PoolMeta):
         to_post = set()
         for sale in sales:
             grouping = getattr(sale.party, 'sale_invoice_grouping_method',
-                               False)
+                False)
+            if Transaction().context.get('skip_grouping', False):
+                grouping = None
             if getattr(sale, 'invoices', None) and not grouping:
                 for invoice in sale.invoices:
                     if not invoice.state == 'draft':
                         continue
                     sale.set_basic_values_to_invoice(invoice)
-                    invoices.extend(([invoice], invoice._save_values))
+                    invoices.extend(([invoice], invoice._save_values()))
                     to_post.add(invoice)
 
         if to_post:
diff --git a/tests/scenario_sale_payment.rst b/tests/scenario_sale_payment.rst
index 2a52c36..98dc53e 100644
--- a/tests/scenario_sale_payment.rst
+++ b/tests/scenario_sale_payment.rst
@@ -203,7 +203,7 @@ Open statements for current device::
     >>> open_statment = Wizard('open.statement')
     >>> open_statment.execute('create_')
     >>> open_statment.form.result == 'sale_payment.open_statement'
-    True
+    False
     >>> payment_statement, = Statement.find([('state', '=', 'draft')])
 
 Partially pay the sale::