Linking rights in 3.8.2

Hi all,

I have a question about linking rights in 3.8.2:

Which right does a user need to be able to link by ‘refers to’?
My users see Permission denied when trying to link (by refers to) to a ticket in a queue where they don’t have sufficient rights. I’d like to assign such “linking right” on a global level, perhaps to the Everyone group, however, I don’t know which specific right to set to achieve this. What rights should I assign to get rid of the permission denied error message?

Thank you in advance for any hint.