Guard invoice fiscal defaults on partial records

invoice.py

@@ -799,8 +799,9 @@ class Invoice(metaclass=PoolMeta):
         "Return an invoice default configured on account configuration."
         Configuration = Pool().get('account.configuration')
         config = Configuration(1)
+        company = getattr(self, 'company', None)
         company_id = (
-            self.company.id if self.company
+            company.id if company
             else Transaction().context.get('company'))
 
         if company_id:
@@ -814,16 +815,26 @@ class Invoice(metaclass=PoolMeta):
         Apply configured fiscal reporting defaults without replacing values
         already selected by the user or copied from another invoice.
         """
-        if self.type == 'out' and not self.revenue_type:
+        invoice_type = getattr(self, 'type', None)
+
+        if (
+                invoice_type == 'out'
+                and 'revenue_type' in self.__class__._fields
+                and not getattr(self, 'revenue_type', None)):
             self.revenue_type = (
                 self._ncf_get_configuration_default_invoice_field(
                     'default_customer_revenue_type'))
-        elif self.type == 'in' and not self.expense_type:
+        elif (
+                invoice_type == 'in'
+                and 'expense_type' in self.__class__._fields
+                and not getattr(self, 'expense_type', None)):
             self.expense_type = (
                 self._ncf_get_configuration_default_invoice_field(
                     'default_supplier_expense_type'))
 
-        if not self.payment_method:
+        if (
+                'payment_method' in self.__class__._fields
+                and not getattr(self, 'payment_method', None)):
             self.payment_method = (
                 self._ncf_get_configuration_default_invoice_field(
                     'default_payment_method'))