problem solved :) 

hi 

i think you should refer the form in your action like this :

<field name="view_id" ref="account.invoice_form"/>

im doing like this but im always getting the supplier form!!!!!!!!!!

Hi,

For Customer Invoice:

<field name="inherit_id" ref="account.invoice_form"/>

For Supplier Invoice :

<field name="inherit_id" ref="account.invoice_supplier_form"/>