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)

}
            debit = line.debit
            credit = line.credit
            amount = line.amount_residual
            amount_currency = line.amount_residual_currency
            
            if line.account_id.internal_type == 'liquidity':
                amount = abs(debit - credit)
                amount_currency = abs(line.amount_currency)
            
            target_currency = target_currency or company_currency
            line_currency = (line.currency_id and line.amount_currency) and line.currency_id or company_currency
            amount_currency_str = ""
            total_amount_currency_str = ""
            if line_currency != company_currency and target_currency != company_currency:
                total_amount = line.amount_currency
                actual_debit = debit > 0 and amount_currency or 0.0
                actual_credit = credit > 0 and -amount_currency or 0.0
            else:
                total_amount = abs(debit - credit)
                actual_debit = debit > 0 and amount or 0.0
                actual_credit = credit > 0 and -amount or 0.0
            if line_currency != target_currency and target_currency != company_currency:
                amount_currency_str = formatLang(self.env, abs(actual_debit or actual_credit), currency_obj=line_currency)
                total_amount_currency_str = formatLang(self.env, total_amount, currency_obj=line_currency)
                ctx = context.copy()
                ctx.update({'date': target_date or line.date})
                total_amount = line_currency.with_context(ctx).compute(total_amount, target_currency)
                actual_debit = line_currency.with_context(ctx).compute(actual_debit, target_currency)
                actual_credit = line_currency.with_context(ctx).compute(actual_credit, target_currency)