Hi E.M,

This is specified in the XML file where you've built the report.An example for the quotation report in Odoo:

<template id="report_saleorder"> 
    <t t-call="report.html_container"> 
        <t t-foreach="doc_ids" t-as="doc_id"> 
            <t t-raw="translate_doc(doc_id, doc_model, 'partner_id.lang', 'sale.report_saleorder_document')"/> 
        </t> 
    </t> 
</template>

That t-raw is telling to get the language from the partner which is filled in on the field partner_id.lang. The report will print in that language, provided it is installed and that there is a translation for the report.

If you don't have the language from some field on the form you can also get it from the 'lang' setting. An example:

<template id="my_custom_report">
    <t t-call="report.html_container">
        <t t-foreach="doc_ids" t-as="doc_id">
            <t t-raw="translate_doc(doc_id, doc_model, 'lang', 'aa_maatwerk_wansheng.my_custom_report_document')"/>
        </t>
    </t>
</template>

Yenthe