Impacted versions:
11.0

I don't know if it is an issue, but I think is strange.

`product_qty` is in unit of `product` : https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L240
`reserved_availability` is in unit of `stock.move` : https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L295

`move.product_qty - move.reserved_availability` seems to have no sens, no ?

https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L915
https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L917
https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L924

thank for your answer

@jco-odoo 
@alnslang 


addons/stock/models/stock_move.py
readonly=True, help='Quantity that has already been reserved for this move')
    availability = fields.Float(
        'Forecasted Quantity', compute='_compute_product_availability',
        readonly=True, help='Quantity in stock that can still be reserved for this move')
    string_availability_info = fields.Text(
        'Availability', compute='_compute_string_qty_information',
        readonly=True, help='Show various information on stock availability for this move')
    restrict_partner_id = fields.Many2one('res.partner', 'Owner ', help="Technical field used to depict a restriction on the ownership of quants to consider when marking this move as 'done'")
    route_ids = fields.Many2many('stock.location.route', 'stock_location_route_move', 'move_id', 'route_id', 'Destination route', help="Preferred route")
    warehouse_id = fields.Many2one('stock.warehouse', 'Warehouse', help="Technical field depicting the warehouse to consider for the route selection on the next procurement (if any).")
    has_tracking = fields.Selection(related='product_id.tracking', string='Product with Tracking')
    quantity_done = fields.Float('Quantity Done', compute='_quantity_done_compute', digits=dp.get_precision('Product Unit of Measure'), inverse='_quantity_done_set')
    show_operations = fields.Boolean(related='picking_id.picking_type_id.show_operations')
    show_details_visible = fields.Boolean('Details Visible', compute='_compute_show_details_visible')
    show_reserved_availability = fields.Boolean('From Supplier', compute='_compute_show_reserved_availability')
    picking_code = fields.Selection(related='picking_id.picking_type_id.code', readonly=True)
    product_type = fields.Selection(related='product_id.type', readonly=True)
    additional = fields.Boolean("Whether the move was added after the picking's confirmation", default=False)
    is_locked = fields.Boolean(compute='_compute_is_locked', readonly=True)
    is_initial_demand_editable = fields.Boolean('Is initial demand editable', compute='_compute_is_initial_demand_editable')
    is_quantity_done_editable = fields.Boolean('Is quantity done editable', compute='_compute_is_quantity_done_editable')
    reference = fields.Char(compute='_compute_reference', string="Reference", store=True)
    has_move_lines = fields.Boolean(compute='_compute_has_move_lines')
    @api.depends('picking_id.is_locked')
    def _compute_is_locked(self):
        for move in self:
            if move.picking_id:
                move.is_locked = move.picking_id.is_locked
    @api.depends('product_id', 'has_tracking', 'move_line_ids', 'location_id', 'location_dest_id')
    def _compute_show_details_visible(self):