Impacted versions: 9.0, 9.0 enterprise

Steps to reproduce:
On current runbot duplicate any posted journal entry which is balanced

Current behavior:
Error message "Cannot create unbalanced entry" is shown

Expected behavior:
New Journal entry is created in state 'draft'

Video/Screenshot link (optional):
![selection_268](https://cloud.githubusercontent.com/assets/14974044/15007437/41f45a56-11d9-11e6-84f3-b297befaa521.png)

addons/account/models/account_move.py
res = super(AccountPartialReconcile, self).create(vals)
        if self._context.get('skip_full_reconcile_check'):
            
            
            return res
        
        
        partial_rec_set = OrderedDict.fromkeys([x for x in res])
        aml_set = self.env['account.move.line']
        total_debit = 0
        total_credit = 0
        total_amount_currency = 0