I've internal location and I want to get stock from it when creating a sales order. So I created a route for that. However, when I create the sales order and choose the route, the available quantity reflect the total stock of the warehouse and not the one for the internal location that specified by the route. I want the available quantity to reflect the stock of the internal location. 

Screenshot (couldn't upload it here):

https://ibb.co/K6d7VpW