<menuitem name="Planned Task" id="base.plannedtask" parent="base.menu_main_pm" sequence="1"/>

 <record id="planned_task_line_tree" model="ir.ui.view">
        <field name="name">planned.task.line.tree</field>
        <field name="model">planned.task.line</field>
        <field name="type">tree</field>
        <field name="arch" type="xml">
            <tree string="Planned Task Line">
                <field name="name"/>
                <field name="product_id" on_change="onchange(product_id)"/>
                <field name="uom_id"/>
                <field name="planned_qty"/>
                <field name="project_weight" />
                <field name="actual_weight" />
                <field name="completion" on_change="onchange_validation(completion)" invisible="1"/>
                <field name="prev_task_completion" invisible="1" />
                <field name="diff_task_completion" invisible="1" />
            </tree>
        </field>
    </record>


    <record id="planned_task_line_form" model="ir.ui.view">
        <field name="name">planned.task.line.form</field>
        <field name="model">planned.task.line</field>
        <field name="type">form</field>
        <field name="arch" type="xml">
            <form string="Planned Task Line" version="7.0">
              <sheet string="Task">
                <h1>
                    <field name="product_id" placeholder="Product..." on_change="onchange(product_id)" domain="[('is_boq','=',True)]"/>
                </h1>
                    <group col="4">
                       <field name="standard_price" invisible="1"/>
                       <field name="qty" invisible="1"/>
                       <field name="actual_amount" invisible="1"/>
                       <field name="uom_id"/>
                       <field name="planned_qty"/>
                       <field name="validated"/>
                       <field name="amount_vatin" />
                       <field name="amount_vatex" />
                       <field name="project_weight" />
                       <field name="actual_weight" />
                       <field name="g_project_id"/>
                       <field name="g_task_id"/>
                       <field name="group_activity_id" />
                       <field name="activities_id" />
                    </group>
                    <group col="6">
                       <field name="completion" on_change="onchange_validation(completion)" invisible="1"/>
                       <field name="prev_task_completion" invisible="1" />
                       <field name="diff_task_completion" invisible="1" />
                    </group>

                </sheet>
            </form>
        </field>
   </record>

    <record model="ir.actions.act_window" id="act_open_planned_task_line">
       <field name="name">Planned Task Line</field>
       <field name="res_model">planned.task.line</field>
       <field name="view_type">form</field> 
       <field name="view_id" ref="planned_task_line_tree"/>
       <field name="context">{ 'tree_view_ref':'planned_task_line_tree'}</field>    
       <field name="view_mode">tree,form</field> 
    </record> 

    <menuitem action="act_open_planned_task_line" id="planned_task_line" name="Planned Task Line" parent="base.plannedtask" sequence="2"/>

This is my sample of creating menu.. hope it will help :D

I'm trying this but don't function

<openerp>

<data>

   <record id="open_view_hr_extension_form" model="ir.actions.act_window">
        <field name="name">Assignment products</field>
        <field name="res_model">hr_extension</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
   </record>

<menuitem id="menu_hr_extension" parent="hr.menu_hr_main" name="Assign goods to Employee" action="open_view_hr_extension_form"/>

<record model="ir.ui.view" id="hr_extension_tree_view">
    <field name="name">hr_extension.tree</field>
    <field name="model">hr_extension</field>
    <field name="type">tree</field>
    <field name="arch" type="xml">
        <tree string="Assignment products">
            <field name="employee_id"/>
            <field name="name"/>
                        <field name="product_id"/>
            <field name="serialno"/>
            <field name="assignment_date"/>
                        <field name="restitution_date"/>
        </tree>
    </field>
</record>

<record model="ir.ui.view" id="hr_extension_form_view">
    <field name="name">hr_extension.form</field>
    <field name="model">hr_extension</field>
    <field name="type">form</field>
    <field name="arch" type="xml">
        <form string="Assignment products">
            <field name="employee_id"/>
            <field name="name"/>
                  <field name="product_id on_change="onchange_product_id(product_id)" />
            <field name="serialno"/>
            <field name="assignment_date"/>
                <field name="restitution_date" />
              </form>
       </field>
</record>
</data>

</openerp>