[dev] Using FreeKey in CustomerMessageNew.dtl

[otrsdev12]

In the file Kernel/Output/HTML/Standard/CustomerMessageNew.dtl there is 
an example on how to use the "FreeTicket" feature to add FreeTicket 
information to the new ticket form that a customer fills out. However, I 
am having trouble using this feature.

I have the following code in my Kernel/Config.pm file:
# Add extra ticket fields
   $Self->{"TicketFreeKey1"} = {
       '' => '-',
       'InventoryNumber' => 'Inventory number',
   };
I then changed the code in CustomerMessageNew.dtl to read
<tr>
   <td>Inventory number:</td>
   <td>$Data{"TicketFreeKey1"}</td>
</tr>
The intent is to have a text box so that the customer can type in the 
inventory number on their computer and to have that inventory number 
automatically populate the FreeKey1 field for the ticket.

How do I get this to work?
Thanks.
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