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
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')
        vals['date'] = vals.get('date') or context.get('date')
        vals['date_maturity'] = vals.get('date_maturity') if vals.get('date_maturity') else vals['date']
        if not move_id:
            if not vals.get('move_id', False):
                if journal.sequence_id:
                    
                    v = {
                        'date': vals.get('date', time.strftime('%Y-%m-%d')),
                        'journal_id': context['journal_id']
                    }
                    if vals.get('ref', ''):
                        v.update({'ref': vals['ref']})
                    move_id = MoveObj.with_context(context).create(v)
                    vals['move_id'] = move_id.id
                else:
                    raise UserError(_('Cannot create an automatic sequence for this piece.\nPut a sequence in the journal definition for automatic numbering or create a sequence manually for this piece.'))
        ok = not (journal.type_control_ids or journal.account_control_ids)
        if ('account_id' in vals):
            account = AccountObj.browse(vals['account_id'])
            if journal.type_control_ids:
                type = account.user_type_id
                for t in journal.type_control_ids: