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
debit-credit == 0 while creating the move lines composing the move.
        """
        AccountObj = self.env['account.account']
        MoveObj = self.env['account.move']
        context = dict(self._context or {})
        amount = vals.get('debit', 0.0) - vals.get('credit', 0.0)
        if not vals.get('partner_id') and context.get('partner_id'):
            vals['partner_id'] = context.get('partner_id')
        if vals.get('move_id', False):
            move = MoveObj.browse(vals['move_id'])
            if move.date and not vals.get('date'):
                vals['date'] = move.date
        if ('account_id' in vals) and AccountObj.browse(vals['account_id']).deprecated:
            raise UserError(_('You cannot use deprecated account.'))
        if 'journal_id' in vals and vals['journal_id']:
            context['journal_id'] = vals['journal_id']
        if 'date' in vals and vals['date']:
            context['date'] = vals['date']
        if ('journal_id' not in context) and ('move_id' in vals) and vals['move_id']:
            m = MoveObj.browse(vals['move_id'])
            context['journal_id'] = m.journal_id.id
            context['date'] = m.date
        
        if not context.get('journal_id', False) and context.get('search_default_journal_id', False):
            context['journal_id'] = context.get('search_default_journal_id')
        if 'date' not in context:
            context['date'] = fields.Date.context_today(self)
        move_id = vals.get('move_id', False)
        journal = self.env['account.journal'].browse(context['journal_id'])
        vals['journal_id'] = vals.get('journal_id') or context.get('journal_id')