[otrs] Ticket to Change link not created

Hi All, I'm using OTRS 3.0.5 with ITSM 3.0 beta2. I've just upgraded from 3.0.5 and 3.0 beta1 as I was hoping it will resolve my issue, but it hasn't. The problem is: When I create a new change using 'Create Change' link on the RfC ticket, the Change is created ok, but I can't see the link between the Change and RfC ticket. I can craete the link manually but this should be automatic. I think it used to work before and I can see that ITSM manual says that 'the system creates a transparent link between the ticket and Change' Please help -- Thank you