contract/__unported__/project_sla/project_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <record id="edit_project_sla" model="ir.ui.view">
            <field name="name">edit_project_sla</field>
            <field name="model">project.project</field>
            <field name="inherit_id" ref="project.edit_project"/>
            <field name="arch" type="xml">

                <!-- make resource calendar always visible -->
                <group string="Administration" position="attributes">
                    <attribute name="groups"/>
                </group>

           </field>
        </record>

    </data>
</openerp>