voucher_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <record id="view_vendor_payment_form" model="ir.ui.view">
            <field name="name">view_vendor_payment_form</field>
            <field name="model">account.voucher</field>
            <field name="inherit_id" ref="account_voucher.view_vendor_payment_form"/>
            <field name="arch" type="xml">
                <field name="writeoff_acc_id" position="after">
                    <field name="exclude_write_off"
                        attrs="{'invisible':[('payment_option','!=','with_writeoff')]}"></field>
                </field>
            </field>
        </record>

        <record id="view_vendor_receipt_dialog_form" model="ir.ui.view">
            <field name="name">view_vendor_receipt_dialog_form</field>
            <field name="model">account.voucher</field>
            <field name="inherit_id" ref="account_voucher.view_vendor_receipt_dialog_form"/>
            <field name="arch" type="xml">
                <field name="writeoff_acc_id" position="after">
                    <field name="exclude_write_off"
                        attrs="{'invisible':[('payment_option','!=','with_writeoff')]}"></field>
                </field>
            </field>
        </record>

        <record id="view_vendor_receipt_form" model="ir.ui.view">
            <field name="name">view_vendor_receipt_form</field>
            <field name="model">account.voucher</field>
            <field name="inherit_id" ref="account_voucher.view_vendor_receipt_form"/>
            <field name="arch" type="xml">
                <field name="writeoff_acc_id" position="after">
                    <field name="exclude_write_off"
                        attrs="{'invisible':[('payment_option','!=','with_writeoff')]}"></field>
                </field>
            </field>
        </record>
    </data>
</openerp>