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)

""" Returns two lines whose amount are opposite """
        
        partner_id_condition = partner_id and 'AND a.partner_id = %(partner_id)s AND b.partner_id = %(partner_id)s' or ''
        query = """
                SELECT a.id, b.id
                FROM account_move_line a, account_move_line b
                WHERE a.amount_residual = -b.amount_residual
                AND NOT a.reconciled AND NOT b.reconciled
                AND a.account_id = %(account_id)s AND b.account_id = %(account_id)s
                {partner_id_condition}
                ORDER BY a.date asc
                LIMIT 10
            """.format(**locals())
        self.env.cr.execute(query, locals())
        pairs = self.env.cr.fetchall()
        
        all_pair_ids = [element for tupl in pairs for element in tupl]
        allowed_ids = set(self.env['account.move.line'].browse(all_pair_ids).ids)
        pairs = [pair for pair in pairs if pair[0] in allowed_ids and pair[1] in allowed_ids]
        
        if len(pairs) > 0:
            target_currency = (self.currency_id and self.amount_currency) and self.currency_id or self.company_id.currency_id
            lines = self.browse(list(pairs[0]))
            return lines.prepare_move_lines_for_reconciliation_widget(target_currency=target_currency)
        return []
    @api.model
    def domain_move_lines_for_reconciliation(self, excluded_ids=None, str=False):