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 


'views': [(view.id, 'form')],
            'view_id': view.id,
            'target': 'new',
            'res_id': self.id,
            'context': dict(
                self.env.context,
                show_lots_m2o=self.has_tracking != 'none' and (self.picking_type_id.use_existing_lots or self.state == 'done' or self.origin_returned_move_id.id),  
                show_lots_text=self.has_tracking != 'none' and self.picking_type_id.use_create_lots and not self.picking_type_id.use_existing_lots and self.state != 'done' and not self.origin_returned_move_id.id,
                show_source_location=self.location_id.child_ids,
                show_destination_location=self.location_dest_id.child_ids,
                show_package=not self.location_id.usage == 'supplier',
                show_reserved_quantity=self.state != 'done'
            ),
        }
    def _do_unreserve(self):
        moves_to_unreserve = self.env['stock.move']
        for move in self:
            if move.state == 'cancel':
                
                continue
            if move.state == 'done':
                if move.scrapped:
                    
                    continue
                else:
                    raise UserError(_('Cannot unreserve a done move'))
            moves_to_unreserve |= move
        moves_to_unreserve.mapped('move_line_ids').unlink()
        return True
    def _push_apply(self):