Configuration:
- Company Currency: MXN
- Tax 16%.
- Multicurrency, MXN and USD.
- Decimal precision: 4
- Currency Data:
MXN: rate 1.0
USD rates

| Database time | rate | Local time (Mexico) | 
| --- | --- | --- |
| 2016-09-09 00:00:01 | 0.054440 | 2016-09-08 17:00:01 |
| 2016-10-11 00:00:01 | 0.051815 | 2016-10-10 17:00:01 |

Steps to reproduce:

1. Create an invoice for 600 USD  + tax (16%) with date 09/09/16 (September 9, 2016) and when you validate in the journal entry is $12,784.7172 MXN.
3. Create a bank statement in MXN and add a line with date 11/10/16 (October 11, 2016) and amount $13,372.80 MXN.
4. When reconcile select the invoice and there is a difference ($588.0828 MXN) add a line with the difference and select an account for the difference. 
<img width="607" alt="captura de pantalla 2016-11-04 a la s 17 23 26" src="https://cloud.githubusercontent.com/assets/6758279/20025385/749605a2-a2b3-11e6-8b1a-4e9fbf1521ed.png">

**Note that the amount of difference is $588.08 in when you select the account**

5. Click on reconcile.

Expected behavior:
- Reconcile the invoice and create account move.

Current behavior:
- Raise an error  `Wrong credit or debit value in accounting entry !`

![captura de pantalla 2016-11-01 a la s 19 18 52](https://cloud.githubusercontent.com/assets/6758279/19913537/1c272866-a069-11e6-9b06-5851681c7fa5.png)

sign_partial_line = sign if partial_line.credit_move_id == line else (-1 * sign)
                amount += sign_partial_line * partial_line.amount
                
                if line.currency_id:
                    if partial_line.currency_id and partial_line.currency_id == line.currency_id:
                        amount_residual_currency += sign_partial_line * partial_line.amount_currency
                    else:
                        if line.balance and line.amount_currency:
                            rate = line.amount_currency / line.balance
                        else:
                            date = partial_line.credit_move_id.date if partial_line.debit_move_id == line else partial_line.debit_move_id.date
                            rate = line.currency_id.with_context(date=date).rate
                        amount_residual_currency += sign_partial_line * line.currency_id.round(partial_line.amount * rate)
            
            
            reconciled = False
            digits_rounding_precision = line.company_id.currency_id.rounding
            if float_is_zero(amount, precision_rounding=digits_rounding_precision):
                if line.currency_id and line.amount_currency:
                    if float_is_zero(amount_residual_currency, precision_rounding=line.currency_id.rounding):
                        reconciled = True
                else:
                    reconciled = True
            line.reconciled = reconciled
            line.amount_residual = line.company_id.currency_id.round(amount * sign)
            line.amount_residual_currency = line.currency_id and line.currency_id.round(amount_residual_currency * sign) or 0.0
    @api.depends('debit', 'credit')
    def _store_balance(self):