Change to reflect new condition on move line: amount second currency is now always positive.

invoice.py

@@ -630,6 +630,7 @@ class Invoice(OSV):
             res['amount_second_currency'] = currency_obj.compute(cursor, user,
                     invoice.company.currency, amount,
                     invoice.currency, context=context)
+            res['amount_second_currency'] = abs(res['amount_second_currency'])
             res['second_currency'] = invoice.currency.id
         else:
             res['amount_second_currency'] = Decimal('0.0')
@@ -637,7 +638,6 @@ class Invoice(OSV):
         if amount >= Decimal('0.0'):
             res['debit'] = Decimal('0.0')
             res['credit'] = amount
-            res['amount_second_currency'] = - res['amount_second_currency']
         else:
             res['debit'] = - amount
             res['credit'] = Decimal('0.0')