Split ticket with reference to original ticket in customer interface

Hi,
In the agent interface, when splitting a ticket, there is a "Linked Objects" reference to the original parent ticket.
In the customer interface this "Linked Objects" is not visible and a customer cannot, in their interface, navigate from the child ticket to the parent ticket.
Does anyone have an idea how I can place a link to the original ticket in a split ticket? Or is there an option to allow a customer to see the links between tickets.
Here the link that is generated when I click on "Split"
http://support.com/otrs/index.pl?Action=AgentTicketPhone;TicketID=20208;Arti...
It is the LinkTicketID that I am interested in. The following, when placed in a template works, but gives me a link to the current ticket, not the original ticket.
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Rudolf Bargholz