Hi,

To make a field read-only for users who do not belong to a specified group:

is_boolean_field = fields.Boolean(compute="_compute_is_boolean_field")

def _compute_is_boolean_field(self):

        for record in self:

            if not record.env.user.has_group("Provide the group that you want the restriction"):

                 record.is_boolean_field = True

            else:

                record.is_boolean_field = False

xml:

<page string="Item">

    <field name="item_line_ids">

        <tree editable="bottom">

            <field name="document_name" column_invisible="True"/>

            <field name="name"  readonly="True"/>

            <field name="number_of_pages" readonly="True"/>

            <field name="document" widget="binary" filename="document_name"/>

            <field name="state"/>

            <field name="comment"

                   readonly="is_boolean_field == True"/>

        </tree>

    </field>

</page>

Hope it helps