enterprise-addons/project_sale_subscription/demo/project_task_demo.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <data>
        <function model="project.task" name="write">
            <value model="project.task" search="[('sale_line_id', '=', ref('project_sale_subscription.subscription_project_line_1'))]"/>
            <value eval="{
                'milestone_id': ref('project.project_home_construction_milestone_3'),
                'stage_id': ref('project.project_stage_1'),
                'user_ids': [Command.link(ref('base.user_demo'))],
            }"/>
        </function>
        <function model="project.task" name="write">
            <value model="project.task" search="[('sale_line_id', '=', ref('project_sale_subscription.subscription_project_line_2'))]"/>
            <value eval="{
                'milestone_id': ref('project.project_home_construction_milestone_3'),
                'stage_id': ref('project.project_stage_1'),
                'user_ids': [Command.link(ref('base.user_demo'))],
            }"/>
        </function>
    </data>
</odoo>