I'm trying to inherit Many2one fields ("project and task") in sale.order form view. I can see the fields but I can choose all task in my task field. I want to related it to project field because when I choose a project, I must see only that project's task. Also I want to see  task field just when I choose a project. I tried to do it like this;

class SaleOder(models.Model):

_inherit = "sale.order"

project_id = fields.Many2one(comodel_name="project.project", string="Project")

task_id =fields.Many2one(comodel_name="project.task", related="project.task.name",  string="Task")