Thanks for your comment. Can this be an expression instead of writing an xml? I use Odoo SaaS in the cloud, and thought I´d be able to express this under Settings->Technical->Security->Record Rules

Hi,

Create record rule as follows:

<record id="rule_contact_limited_access" model="ir.rule">

    <field name="name">Contact Limited Access</field>

    <field name="model_id" ref="base.model_res_partner"/>

    <field name="domain_force">['|', ('create_uid', '=', user.id), ('relationship', '=', 'shared')]</field>

    <field name="groups" eval="[(4, ref('group_id'))]"/>

</record>

Hope it helps