diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index 67a55d8f451..ffb9bb3ef0c 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -613,12 +613,27 @@ class account_move_line(osv.osv):
                     return False
         return True
 
+    def _check_currency_and_amount(self, cr, uid, ids, context=None):
+        for l in self.browse(cr, uid, ids, context=context):
+            if (l.currency_id and not l.amount_currency) or (not l.currency_id and l.amount_currency):
+                return False
+        return True
+
+    def _check_currency_amount(self, cr, uid, ids, context=None):
+        for l in self.browse(cr, uid, ids, context=context):
+            if l.amount_currency:
+                if (l.amount_currency > 0.0 and l.credit > 0.0) or (l.amount_currency < 0.0 and l.debit > 0.0):
+                    return False
+        return True
+
     _constraints = [
         (_check_no_view, 'You cannot create journal items on an account of type view.', ['account_id']),
         (_check_no_closed, 'You cannot create journal items on closed account.', ['account_id']),
         (_check_company_id, 'Account and Period must belong to the same company.', ['company_id']),
         (_check_date, 'The date of your Journal Entry is not in the defined period! You should change the date or remove this constraint from the journal.', ['date']),
         (_check_currency, 'The selected account of your Journal Entry forces to provide a secondary currency. You should remove the secondary currency on the account or select a multi-currency view on the journal.', ['currency_id']),
+        (_check_currency_and_amount, "You cannot create journal items with a secondary currency without recording both 'currency' and 'amount currency' field.", ['currency_id','amount_currency']),
+        (_check_currency_amount, 'The amount expressed in the secondary currency must be positif when journal item are debit and negatif when journal item are credit.', ['amount_currency']),
     ]
 
     #TODO: ONCHANGE_ACCOUNT_ID: set account_tax_id