[otrs] Sla based on Priority

Hello Team , I have installed OTRS (V 3.0.6). In my setup, I am mapping SLA and priority on impact rather than service based SLA changes. Which would mean that if I am changing my priority, from the priority tab, I would need to change my impact, which would define the priority and SLA for that ticket as well. This is working fine. I am able to get it working. Now what I am getting stuck on is the SLA escalation time etc. When I change the impact SLA and priority changes but the co-responding escalation times are not getting reflected in the ticket information. I am confused about defining the calendar and queue based escalation times too. Please help, I have been stuck on this for a very long time. Thanks & Regards Rahul Singhal