Team Calendar

Goodday All,

I have a query on the above. We have just upgraded our 4.7 system to ECC6. With the new release, the entire team calendar is a bit different. Based on our configuration, in Leave request service, normal ESS users are available to view the team calendar for all subordinates within the same org. And for MSS users, managers will be able to see the same list under teh team calendar service. My Question is, leave request which was approved before the upgrade are not showing in both the calendars. Only for new leave request (post upgrade), the data will be appearing in teh team calendar. Is there any missing config on my end?

Thanks in advance