Adding Responsible to Search results

[consolut]

Hello,

I try to add the Ticket Responsible to the overview of search results. I tried to do so by editing the file AgentTicketSearchResultPrint.dtl. I added the Lines marked red:
<table border="0" width="100%" cellspacing="0" cellpadding="4">
<tr>
<td class="contentbody">
<table border="0" width="100%" cellspacing="0" cellpadding="3">
<tr>
<td width="15%" class="contentkey">$Config{"Ticket::Hook"}</td>
<td width="15%" class="contentkey">$Text{"Created"}</td>
<td width="25%" class="contentkey">$Text{"From"}/$Text{"Subject"}</td>
<td width="15%" class="contentkey">$Text{"State"}/$Text{"Queue"}</td>
<td width="15%" class="contentkey">$Text{"Owner"}</td>
<td width="15%" class="contentkey">$Text{"Responsible"}</td>
<td width="15%" class="contentkey">$Text{"CustomerID"}</td>
</tr>
<!-- dtl:block:Record -->
<tr>
<td class="contentvalue">$Data{"TicketNumber"}</td>
<td class="contentvalue">$TimeLong{"$Data{"Created"}"}</td>
<td class="contentvalue">$QData{"From","30"}<br/>$QData{"Subject","30"}</td>
<td class="contentvalue">$Quote{"$Text{"$Data{"State"}"}","30"}<br/>$QData{"Queue","30"}</td>
<td class="contentvalue">$QData{"Owner","30"} ($Quote{"$Data{"UserFirstname"} $Data{"UserLastname"}","30"})</td>
<td class="contentvalue">$QData{"Responsible","30"} ($Quote{"$Data{"UserFirstname"} $Data{"UserLastname"}","30"})</td>
<td class="contentvalue">$QData{"CustomerID","15"}&nbsp;<br/>$QData{"CustomerName","15"}</td>
</tr>

Unfortunately this doesn't work. The Overview is still the same.
Can anybody tell me how I can add the collum to the Result Overview?

Thanks in advance