diff --git a/modules/account/move.py b/modules/account/move.py
index 048d3f7..e0299e7 100755
--- a/modules/account/move.py
+++ b/modules/account/move.py
@@ -1120,11 +1120,13 @@ class Line(DescriptionOriginMixin, MoveLineMixin, ModelSQL, ModelView):
 
     def get_rate(self,name=None):
         amount = self.credit if self.credit else self.debit
-        if self.amount_second_currency and amount:
-            return round(abs(self.amount_second_currency) / amount, 6)
+        amount_second_currency = getattr(self, 'amount_second_currency', None)
+        if amount_second_currency and amount:
+            return round(abs(amount_second_currency) / amount, 6)
 
     def _set_rate_from_amounts(self):
-        if self.amount_second_currency and not self.rate:
+        if (getattr(self, 'amount_second_currency', None)
+                and not getattr(self, 'rate', None)):
             self.rate = self.get_rate()
 
     @fields.depends(
@@ -1597,7 +1599,8 @@ class Line(DescriptionOriginMixin, MoveLineMixin, ModelSQL, ModelView):
         lines = super(Line, cls).create(vlist)
         to_save = []
         for line in lines:
-            if line.amount_second_currency and not line.rate:
+            if (getattr(line, 'amount_second_currency', None)
+                    and not getattr(line, 'rate', None)):
                 line._set_rate_from_amounts()
                 to_save.append(line)
         if to_save:
diff --git a/modules/account_invoice/invoice.py b/modules/account_invoice/invoice.py
index a93c90c..ef45aa0 100755
--- a/modules/account_invoice/invoice.py
+++ b/modules/account_invoice/invoice.py
@@ -1991,9 +1991,9 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin, InvoiceReportMixin):
                 move_line_.account = gl.product.account_stock_in_used
 
             move_lines = [move_line,move_line_]
-            if move_line.amount_second_currency:
+            if getattr(move_line, 'amount_second_currency', None):
                 move_line.rate = move_line.get_rate()
-            if move_line_.amount_second_currency:
+            if getattr(move_line_, 'amount_second_currency', None):
                 move_line_.rate = move_line_.get_rate()
 
             if drop:
@@ -2032,9 +2032,9 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin, InvoiceReportMixin):
                         drop_line_.second_currency = self.currency
                         drop_line_.amount_second_currency = -original_amount
                 move_lines = [drop_line,drop_line_]
-                if drop_line.amount_second_currency:
+                if getattr(drop_line, 'amount_second_currency', None):
                     drop_line.rate = drop_line.get_rate()
-                if drop_line_.amount_second_currency:
+                if getattr(drop_line_, 'amount_second_currency', None):
                     drop_line_.rate = drop_line_.get_rate()
             
             return move_lines