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)

addons/account/models/account_move.py
result = []
        for line in self:
            if line.ref:
                result.append((line.id, (line.move_id.name or '') + '(' + line.ref + ')'))
            else:
                result.append((line.id, line.move_id.name))
        return result
    @api.model
    def compute_amount_fields(self, amount, src_currency, company_currency, invoice_currency=False):
        """ Helper function to compute value for fields debit/credit/amount_currency based on an amount and the currencies given in parameter"""
        amount_currency = False
        currency_id = False
        if src_currency and src_currency != company_currency:
            amount_currency = amount
            amount = src_currency.with_context(self._context).compute(amount, company_currency)
            currency_id = src_currency.id
        debit = amount > 0 and amount or 0.0
        credit = amount < 0 and -amount or 0.0
        if invoice_currency and invoice_currency != company_currency and not amount_currency:
            amount_currency = src_currency.with_context(self._context).compute(amount, invoice_currency)
            currency_id = invoice_currency.id
        return debit, credit, amount_currency, currency_id
    @api.multi
    def create_analytic_lines(self):