[otrs] Adding new fields to customer tickets

Hello Guys, I'm new to OTRS and Perl development and I'm having trouble adding some new fields to the customer ticket form. One of these fields is the ticket complexity. I've created the table "ticket_complexity" and associated it to the table "ticket". Then, I've created the file Kernel::System::Complexity. On the CustomerTicketMessage.dtl I've added the following code (PS.: this field is a combobox, but I've created as a text field just to see if it would work): ... <!-- dtl:block:TicketComplexity --> <div> <label for="Complexity" class="Mandatory"> <span class="Marker">*</span> $Text{"Complexity"}: </label> <div id="SubjectError" class="TooltipErrorMessage" ><p>$Text{"This field is required."}</p></div>