Data of cluster B2 doesn't import in payroll calculation process

Hi Friends,

I have an issue about PT & PY integration:

At first, I execute PT60 then check data of Cluster B2 by PT66 then execute Payroll Driver program...

For first and second moths of current year , there are not any Problems, and payroll is calculated right.

after these 2 month, despite the data in cluster B2, these data don't import in payroll calculation process...

I don't know why?

I appreciate your help in advance.

Best Regards,

Leila