extra_data_dikasa/views/account_invoice.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>
    <record model="ir.ui.view" id="dikasa_invoice_form">
       <field name="name">dikasa_invoice_form</field>
       <field name="model">account.invoice</field>
       <field name="inherit_id" ref="account.invoice_form"/>
       <field name="arch" type="xml">
         <field name="partner_id" position="replace">
           <field name="partner_id" domain="[('customer','=',True)]" options='{"always_reload": True}'/>
         </field>
         <field name="partner_id" position="after">
            <field name="street"/>
            <field name="state_id"/>
            <field name="country_id"/>
            <field name="email"/>
            <field name="phone"/>
            <field name="mobile"/>
            <field name="credit_limit"/>
         </field>
         <field name="user_id" position="attributes">
            <attribute name="string">Vendedor</attribute>
         </field>
         <field name="user_id" position="after">
            <field name="create_uid" readonly="1"/>
         </field>
      </field>
    </record>

    <record model="ir.ui.view" id="dikasa_invoice_supplier_form">
       <field name="name">dikasa_invoice_supplier_form</field>
       <field name="model">account.invoice</field>
       <field name="inherit_id" ref="account.invoice_supplier_form"/>
       <field name="arch" type="xml">
         <field name="partner_id" position="replace">
           <field name="partner_id" domain="[('supplier','=',True)]" options='{"always_reload": True}'/>
         </field>
         <field name="partner_id" position="after">
            <field name="street"/>
            <field name="state_id"/>
            <field name="country_id"/>
            <field name="email"/>
            <field name="phone"/>
            <field name="mobile"/>

         </field>
         <field name="user_id" position="attributes">
            <attribute name="string">Vendedor</attribute>
         </field>
         <field name="user_id" position="after">
            <field name="create_uid" readonly="1"/>
         </field>
      </field>
    </record>

</data>
</openerp>