I need to change the format of invoices. I managed to do some changes to header/footer by Settings-> Company-> header/footer. I need to add one more text line but i couldn't. it is overlapping with another text.

This is the change done by me.

<lines>1.3cm 27.7cm 20cm 27.7cm</lines>

        <drawRightString x="20cm" y="27.8cm">[[ company.rml_header1 ]]</drawRightString>

        <drawString x="1.3cm" y="27.3cm">[[ company.partner_id.name ]]</drawString>

        <place x="1.3cm" y="25.3cm" height="1.8cm" width="15.0cm">

            <para style="main_header">[[ display_address(company.partner_id) or  '' ]]</para>

        </place>

        <drawString x="1.3cm" y="25.0cm">Phone:</drawString>

        <drawRightString x="7cm" y="25.0cm">[[ company.partner_id.phone or '' ]]</drawRightString>

        <drawString x="1.3cm" y="24.6cm">Mail:</drawString>

        <drawRightString x="7cm" y="24.6cm">[[ company.partner_id.email or '' ]]</drawRightString>

       <drawLeftString x="1.3cm" y="24.6cm">Our VAT Reg No : </drawLeftString>

        <lines>1.3cm 24.5cm 7cm 24.5cm</lines>

I need to add VAT number after the company details in page header.