Hi, I tried with what you mentioned but it didn't work, because there was a previous rule that overlapped because it applied to all internal users, I tried to inherit that rule but it was encapsulated in " <data noupdate="1"> " so the active value in False didn't work. To solve it I did the following using functions:

<function name="write" model="ir.model.data">
    <value model="ir.model.data"
           search="[('module', '=', 'project'), ('name', '=', 'project_public_members_rule')]"/>
    <value eval="{'noupdate': False}"/>
</function>

<record id="project.project_public_members_rule" model="ir.rule">
    <field name="active" eval="False"/>
</record>

<function name="write" model="ir.model.data">
    <value model="ir.model.data"
           search="[('module', '=', 'project'), ('name', '=', 'project_public_members_rule')]"/>
    <value eval="{'noupdate': True}"/>
</function>

Thanks for your help, if you can close this please doit, because it says that i don't have enouhg XP.

Hi 

<record model="res.groups" id="group_grant_project_employee">

    <field name="name">Project Employee</field>

    <field name="category_id" ref="base.module_category_services_project"/>

</record>

1. Define a record rule for the project.project model to restrict access to projects based on task.

Hope it helps