How to use GET_PAY_AVAILABILITY based on planned schedule for absence duration fast formula

I am using the below syntax to calculate duration based on planned schedule but it is not picking the schedule duration from planned and only checking the work schedule assignment data

daily_hours = GET_PAY_AVAILABILITY(
'ASSIGN',
daily_start,
daily_end,
'Y','Y','Y','Y','H','N','Y',0,'08:30','0-1-1-1-1-1-0','N','ORA_ANC_PUB_SCHED'
)