Leave quota is not deducted from ESS

Hi Experts

I am using the ECC 6.0, EP 6.0. and using the standard SAP leave workflow 12300111 for leave approvals.

When I want to see the quota in ESS it shows the perfect number of leave quota as in SAP R3.

But when I am trying to apply for a leave it says" Attendance/absence type 0200 (Casual leave) require minimum of 1 Attendance/absence days".

What could be the problem??

Plz suggest.....

Thanks

Sheetal