Amol,

You would need to go to the source file of the report of invoice(account/report/account_print_invoice.rml) and do the changes like:

[[ (o.partner_id and o.partner_id.firstname) or '' ]][[ (o.partner_id and o.partner_id.surname) or '' ]]

The bold text should be your right field name.

This should help.

Thanks.

Thanks for Reply

Amol :-)