**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.


result['product_uos_qty'] = float_round(product_qty * uos_coeff['uos_coeff'], precision_digits=precision)
        else:
            result['product_uos_qty'] = product_qty
        return {'value': result, 'warning': warning}
    def onchange_uos_quantity(self, cr, uid, ids, product_id, product_uos_qty,
                          product_uos, product_uom):
        """ On change of product quantity finds UoM and UoS quantities
        @param product_id: Product id
        @param product_uos_qty: Changed UoS Quantity of product
        @param product_uom: Unit of measure of product
        @param product_uos: Unit of sale of product
        @return: Dictionary of values
        """
        result = {
            'product_uom_qty': 0.00
        }
        if (not product_id) or (product_uos_qty <= 0.0):
            result['product_uos_qty'] = 0.0
            return {'value': result}
        product_obj = self.pool.get('product.product')
        uos_coeff = product_obj.read(cr, uid, product_id, ['uos_coeff'])
        
        
        if product_uos and product_uom and (product_uom != product_uos):
            precision = self.pool.get('decimal.precision').precision_get(cr, uid, 'Product Unit of Measure')
            result['product_uom_qty'] = float_round(product_uos_qty / uos_coeff['uos_coeff'], precision_digits=precision)
        else:
            result['product_uom_qty'] = product_uos_qty
        return {'value': result}
    def onchange_product_id(self, cr, uid, ids, prod_id=False, loc_id=False, loc_dest_id=False, partner_id=False):