Service field grayed out

Hi,

I'm attempting to create a new ticket and assign it to a service. I 
already have a few services created, but when I create a new ticket, the 
service field isn't active and I can't assign the ticket to the service 
as it is shown here: 
http://doc.otrs.com/doc/manual/itsm/stable/en/html/ch06s02.html

I'm running OTRS + ITSM Module at 5.0.19

Cheers,
Pedro
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