**Impacted versions:** 8.0

**Steps to reproduce:**
To reproduce it is necessary the fifo configuration in the assignation of quants in moves.

- Create a sale order with two lines of the same product, one of that line with a route that generate moves between warehouse.

<img width="1231" alt="skitch 65" src="https://cloud.githubusercontent.com/assets/11341058/24102907/d575a638-0d53-11e7-922e-a3f034d43e94.png">

The route used has three pull rules:

1. From Stock Warehouse_1 to Virtual Locations/Inter Company Transit
2. From Virtual Locations/Inter Company Transit to Stock Warehouse_2
3. From Stock Warehouse_2 to Customers

<img width="1224" alt="skitch 66" src="https://cloud.githubusercontent.com/assets/11341058/24103147/b7c2bfbc-0d54-11e7-955c-87247a10e0bd.png">

- Confirm the sale order. It must be created three pickings:

<img width="1226" alt="skitch 67" src="https://cloud.githubusercontent.com/assets/11341058/24103498/d90c9b38-0d55-11e7-97ff-f986df8cdd9b.png">

- Transfer first two pickings.

<img width="1230" alt="skitch 70" src="https://cloud.githubusercontent.com/assets/11341058/24104496/b7b0be8a-0d58-11e7-89a2-4331fceec1d8.png">

- Before transfer third picking, review that one move has reserved the quant correctly because was reserved from the previous pickings.

<img width="1215" alt="skitch 68" src="https://cloud.githubusercontent.com/assets/11341058/24103908/23952cc8-0d57-11e7-9346-bd48d7edb54a.png">

**Current behavior:**

When check availability of this third picking, the quant already reserved is moved to the other move.

<img width="1264" alt="skitch 69" src="https://cloud.githubusercontent.com/assets/11341058/24104056/8be11616-0d57-11e7-8763-a90507315b19.png">
 
**Expected behavior:**

When check availability of this third picking, the moves already reserved must not be altered.


if (not pick.move_lines) or any([x.state == 'draft' for x in pick.move_lines]):
                res[pick.id] = 'draft'
                continue
            if all([x.state == 'cancel' for x in pick.move_lines]):
                res[pick.id] = 'cancel'
                continue
            if all([x.state in ('cancel', 'done') for x in pick.move_lines]):
                res[pick.id] = 'done'
                continue
            order = {'confirmed': 0, 'waiting': 1, 'assigned': 2}
            order_inv = {0: 'confirmed', 1: 'waiting', 2: 'assigned'}
            lst = [order[x.state] for x in pick.move_lines if x.state not in ('cancel', 'done')]
            if pick.move_type == 'one':
                res[pick.id] = order_inv[min(lst)]
            else:
                
                
                
                res[pick.id] = order_inv[max(lst)]
                if not all(x == 2 for x in lst):
                    if any(x == 2 for x in lst):
                        res[pick.id] = 'partially_available'
                    else:
                        
                        for move in pick.move_lines:
                            if move.partially_available:
                                res[pick.id] = 'partially_available'
                                break
        return res
    def _get_pickings(self, cr, uid, ids, context=None):