diff --git a/modules/account/move.py b/modules/account/move.py
index 594a587f7d..8263aa3ca5 100644
--- a/modules/account/move.py
+++ b/modules/account/move.py
@@ -355,9 +355,11 @@ class Move(DescriptionOriginMixin, ModelSQL, ModelView):
         '''
         pool = Pool()
         MoveLine = pool.get('account.move.line')
+        Currency = pool.get('currency.currency')
         line = MoveLine.__table__()
         transaction = Transaction()
         cursor = transaction.connection.cursor()
+        cast = Currency.rounding.sql_cast
 
         for company, moves in groupby(moves, key=lambda m: m.company):
             currency = company.currency
@@ -370,7 +372,7 @@ class Move(DescriptionOriginMixin, ModelSQL, ModelView):
                 group_by=line.move,
                 having=Abs(Round(
                         Sum(line.debit - line.credit),
-                        currency.digits)) < abs(currency.rounding))
+                        currency.digits)) < cast(abs(currency.rounding)))
             cursor.execute(*line.update(
                     [line.state],
                     ['valid'],
@@ -382,7 +384,7 @@ class Move(DescriptionOriginMixin, ModelSQL, ModelView):
                 group_by=line.move,
                 having=Abs(Round(
                         Sum(line.debit - line.credit),
-                        currency.digits)) >= abs(currency.rounding))
+                        currency.digits)) >= cast(abs(currency.rounding)))
             cursor.execute(*line.update(
                     [line.state],
                     ['draft'],