server-tools/sql_export_excel/views/sql_export_view.xml

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


    <record id="sql_export_excel_view_form" model="ir.ui.view">
        <field name="model">sql.export</field>
        <field name="inherit_id" ref="sql_export.sql_export_view_form" />
        <field name="arch" type="xml">
            <field name="file_format" position="after">
                <field name="header" attrs="{'invisible': [('file_format', '=', 'csv')]}"/>
                <field name="attachment_id" attrs="{'invisible': [('file_format', '!=', 'excel')]}"/>
                <field name="sheet_position" attrs="{'invisible': [('attachment_id', '=', False)]}"/>
                <field name="row_position" attrs="{'invisible': [('attachment_id', '=', False)]}"/>
                <field name="col_position" attrs="{'invisible': [('attachment_id', '=', False)]}"/>
            </field>
        </field>
    </record>

</data>
</openerp>