Michiel,
Basically, it's just as I described here:
http://lists.otrs.org/pipermail/otrs/2010-March/031382.html
On Tue, Mar 9, 2010 at 8:26 PM, Justin Noel <otrs@jandgnoel.com> wrote:
> I can't find anything that describes how to safely customize a module in
> OTRS. I want to be able to modify a module and not worry about it getting
> overridden in a future upgrade.
> For example, I've made changes to AgentTicketZoom.pm. If I ever upgrade
> OTRS, it's just going to get replaced. How do I prevent this from
> happening?
> Thanks,
> Justin Noel
> http://www.calendee.com
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