Hi,
Just check if Employee had already raised some more leave requests for same leave type in past and all leaves are in SENT status in PTARQ - if you add on all the absence hours of SENt status leave request work item and if it exceeds the quota entitled to the employee, ESS will throw such error of no available quota.
while applying leave on ESS, system checks all absences from PTARQ and IT 2001 for the same absence type.
Solution:
Delete the SENT status leave type if it is not relevant or get it rejected by manager and then let user try to apply leave on ESS.
Hope this helps,
Regards
Shipra