Hello Alexander, thanks for the feedback.
I don't think there is a solution for your requirement out of the box. The only approach I think of is to write a javascript-code for one ticket-freetext-field. When clicking on a new link beside the freetext-value-field (which is a string-field), a page would open with a multiple-selection-box. The selection are taken over in the freetext-field by confirming/closing the page through javascript.
This machanismn would be similiar to the customer-addressbox.
I guess, that would work. Maybe I am going to try to avoid the pop-up page and embed the whole thing into the affected page itself. I reckon the users won't like a new page (too many clicks..). Furthermore, I am probably going to prohibit any manual user entry into the free field itself as I do only want to have clean values selected from the list and no typos... Ok, I'll settle with some JavaScript-foo. Thanks. Cheers Tobias -- The difference between fiction and reality? Fiction has to make sense. -- Tom Clancy