Hi all, I'm really new to Odoo. yeah, again, I got another inheritance problem.

The issue I'm facing is that: After inheritance hr.expense to my custom module "expense_new", I would like to create new view to it, tree view seems works fine (maybe I did it wrong tho) but its form view display all the fields including new field I added. (all field display regardless its invisible attribute, more than 25 fields displayed on the screen). I believe It is something wrong on XML file.

The way I'm using to inherit is "_inherits", and here is my code:   

class expenseNew(models.Model):    
    _name = 'expense_new.expense_new'    
    _inherits = {'hr.expense': 'expense_new_id'}    
    expense_new_id = fields.Many2one('hr.expense', help="This is a many2one field in expense_new module, and this field is used as a link to hr.expense module")    
    # ......Override original fields......    
    name = fields.Char(string='Expense Summary', readonly=True, required=True, states={'draft': [('readonly', False)], 'refused': [('readonly', False)]})    
    ...    
    # ......Extra fields/ my own fields......    
    calculate_total_amount = fields.Float(string='Total Cost', store=True, compute='_compute_amount_my', digits=dp.get_precision('Account'))    
    ...

<record id="expense_new_tree_view" model="ir.ui.view">        
    <field name="name">expense_new.expense_new.tree.view</field>        
    <field name="model">expense_new.expense_new</field>        
    <field name="arch" type="xml">            
        <tree string="Expenses">                
            <field name="name"/>                
            <field name="employee_id"/>                
            <field name="date" required="True"/>                
            <field name="state"/>                
            <field name="calculate_total_amount"/>            
        </tree>        
    </field>    
</record>    
<record id="expense_new_form_view" model="ir.ui.view">        
    <field name="name">expense_new.expense_new.form.view</field>        
    <field name="model">expense_new.expense_new</field>        
    <!--<field name="inherit_id" ref="hr_expense.hr_expense_form_view"/>-->        
    <field name="arch" type="xml">            
        <form string="Expenses" class="o_expense_form">                
            <sheet>
                ......                        
                <div class="oe_title">                        
                    <label for="name"/>                        
                    <h1>                            
                        <field name="name" placeholder="e.g. Lunch with Customer"/>                        
                    </h1>                    
                </div>                    
                <group>                        
                    <group>                            
                        <field name="date"/>                            
                        <field name="employee_id" groups="hr_expense.group_hr_expense_user"/>                            
                        <field name="calculate_total_amount"/>                        
                    </group>                    
                </group>                
            </sheet>            
        </form>        
    </field>    
</record>    
<record id="submit_your_expense_action" model="ir.actions.act_window">        
    <field name="name">My Expenses to Submit ("draft" expenses))</field>        
    <field name="res_model">expense_new.expense_new</field>        
    <field name="view_mode">tree,form</field>    
</record>    
<menuitem .../>

And also, In "_inherits" way, is it possible to inherit its "hr_expense.hr_expense_form_view" view by using "inherit_id" on XML and add my own field to it? I guess I cant because, in terms of database, my own field doesn't stored in the "hr_expense" table but it is stored in my own database "expense_new.expense_new", am I right? 

So, If I inherit a view then I should write <field name="model">original_module.model</field> and on the action, <field name="res_model">original_module.model</field> Otherwise (e.g. in this case) I use my own model name, right?

Can somebody please help me out, any hint, reference or suggestion will be useful. Thx a lot!