Hi,

We need to inherit the previous report header.

<template id="report_layout_invoice_ahch_header" inherit_id="web.external_layout_header">>
    <t t-if ="o and 'company_id' in o">
        <t t-set="company" t-value="o.company_id"/>
        <t t-set="customer" t-value="o.partner_id"/>
    </t>

    <div class="header">
        <div class="row" style="font-size:11px; line-height=80%">
            <img  t-if="company.logo" t-att-src="'data:image/png;base64,%s' % company.logo" style="max-height: 140px;"/>
        <div class="col-xs-4 col-xs-offset-2" style="margin-top:10px">
             <span t-field="company.name" style="color:blue"/><br/>
             <span t-field="company.street"/><br/>
             <span t-field="company.street2"/><br/>
             <span t-field="company.country_id"/><span t-field="company.zip"/><br/>
             Phone: <span t-field="company.phone"/><br/>
             Fax: <span t-field="company.fax"/><br/>
             Email: <span t-field="company.email"/><br/>
             <span t-field="company.website"/><br/>
        </div>
        </div>

            <hr style="height:3px;border:none;color:#FF0000;background-color:#FF0000;margin-top:0px;margin-bottom:12px"/>
        </div>

</template>

i hope it will helpful..