[% IF report.get_extra_metadata('grouped_ids') %]
    Your reference numbers
    <br><strong>RBK-[% report.id %], RBK-[% report.get_extra_metadata('grouped_ids').join(', RBK-') %]</strong>
[% ELSE %]
    Your reference number
    <br><strong>RBK-[% report.id %]</strong>
[% END %]