Let say I am changing the tel number of invoice to a barcode
I added the following code to the .rml file
<barCode x="5cm" y="17cm" height="2cm" width="5cm" code="Ean13">[[ (o.partner_id.phone) or removeParentNode('para') ]]</barCode>
and I can only print the number but not the barcode
what should I install to make the barcode?