How to change the Tier in same Activity?

Hi,

I have created a loyalty program and some rules.In that one rule is like when ever points earned >=500.The tier should be changed.

For this i have created a rule for tier transition.

Problem is suppose member has earned 450 points in the present activity he got 50 points total 500.The tier is not getting changed in the next Activity.

Can anybody help me how to change tier in same Activity.

Thanks,

Hari.