tra_backend/attendance_regularization/views/regularization_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
         <record id="view_regular_tree1" model="ir.ui.view">
            <field name="name">attendance.regular_tree</field>
            <field name="model">attendance.regular</field>
            <field name="priority" eval="8" />
            <field name="arch" type="xml">
                <tree string="Attendance Regularization">
                    <field name="employee_id"/>
                    <field name="reg_category"/>
                    <field name="from_date"/>
                    <field name="reg_reason"/>
                    <field name="to_date"/>
                </tree>
            </field>
        </record>

       <record model="ir.actions.act_window" id="action_view_regularization1">
            <field name="name">Regularization Request</field>
            <field name="res_model">attendance.regular</field>
            <field name="view_mode">tree,form</field>
            <field name="domain">[]</field>
            <field name="help" type="html">
                <p class="oe_view_no_content_create">Create new Request
                </p>
            </field>
        </record>

        <menuitem id="regular_onsight" name="Attendance Regularization" parent="hr_attendance.menu_hr_attendance_root"
                    sequence="15" groups="base.group_user" action="action_view_regularization1"/>
        <record id="view_regular_approve_tree" model="ir.ui.view">
            <field name="name">attendance.regular_request_tree</field>
            <field name="model">attendance.regular</field>
            <field name="priority" eval="8" />
            <field name="arch" type="xml">
                <tree string="Approve Regularization">
                    <field name="employee_id"/>
                    <field name="reg_category"/>
                    <field name="from_date"/>
                    <field name="reg_reason"/>
                    <field name="to_date"/>
                </tree>
            </field>
        </record>

        <record id="attendance_regular11" model="ir.ui.view">
            <field name="name">attend.regular</field>
            <field name="model">attendance.regular</field>
            <field name="arch" type="xml">
               <form string="Regularization">
                   <header>
                           <button name="submit_reg" string="Submit" type="object" class="btn-primary"
                           attrs="{'invisible': [('state_select','not in','draft')]}"/>
                           <button name="regular_approval" type="object" string="Approve" class="oe_highlight"
                                   groups="hr_attendance.group_hr_attendance_manager"
                           attrs="{'invisible': [('state_select','not in','requested')]}"/>
                           <button name="regular_rejection" type="object" string="Reject" class="oe_highlight"
                                   groups="hr_attendance.group_hr_attendance_manager"
                           attrs="{'invisible': [('state_select','not in','requested')]}"/>
                           <field name="state_select" widget="statusbar" statusbar_visible="draft,requested,approved"/>
                   </header>
                   <sheet>
                       <group col="4" colspan="4">
                           <field name="reg_category" attrs="{'readonly':[('state_select','=','approved')]}"/>
                           <field name="from_date" attrs="{'readonly':[('state_select','=','approved')]}"/>
                           <field name="reg_reason" attrs="{'readonly':[('state_select','=','approved')]}"/>
                           <field name="to_date" attrs="{'readonly':[('state_select','=','approved')]}"/>
                           <field name="employee_id" attrs="{'readonly':[('state_select','=','approved')]}"/>
                       </group>
                   </sheet>
                 <field name="message_follower_ids" widget="mail_followers" groups="base.group_user"/>
                        <field name="activity_ids" widget="mail_activity"/>
                        <field name="message_ids" widget="mail_thread"/>
               </form>
            </field>
        </record>
          <record model="ir.actions.act_window" id="action_view_request_regularization">
            <field name="name">Attendance Regularization Approval</field>
            <field name="res_model">attendance.regular</field>
            <field name="view_mode">tree,form</field>
            <field name="domain">[('state_select','!=','approved'),('state_select','!=','reject')]</field>
            <field name="help" type="html">
                <p class="oe_view_no_content_create">Create new Record
                </p>
            </field>
        </record>
        <menuitem id="approving_regular"
                  name="Regularization Approval"
                  parent="hr_attendance.menu_hr_attendance_manage_attendances"
                  sequence="25"
                  action="action_view_request_regularization"
                  groups="hr_attendance.group_hr_attendance_manager"/>
    </data>
</odoo>