Use Report Object Inside OpenERP Webkit Report Header -

i'm creating invoice report openerp 7 using webkit engine

i need display invoice number , partner in header.

i've tried using variable directly:

${inv.partner_id.name}

but it's giving me error:

attributeerror: 'undefined' object has no attribute 'partner_id'

is there workaround problem ?

it's possible use inv variable directly in rml

but can't use rml report reason.

thanks before

solved it, can use:

%for inv in objects :

O9