Enable mass validation of monthly statements.

--HG-- branch : 11.0

tests/test_account_report.py

@@ -235,9 +235,9 @@
         """Test monthly statements: Mass validation."""
 
         for partner in (
-            self.env.ref("base.res_partner_7")
-            | self.env.ref("base.res_partner_8")
-            | self.env.ref("base.res_partner_9")
+            self.env.ref("base.res_partner_1")
+            | self.env.ref("base.res_partner_2")
+            | self.env.ref("base.res_partner_3")
         ):
             invoice = self._makeInvoice(partner)
             self._validateInvoices(invoice)