Calculate Absence duration for Payroll period

Summary:

Need to calculate Absence duration for each payroll period.

Content (required):

I'm trying to use GET_ABSENCE_DAYS_PER_TYPE function. I'm trying to pass the start & end dates as PAY_EARN_PERIOD_START, PAY_EARN_PERIOD_END. But Value is not returning

Version (include the version you are using, if applicable):

21d

Code Snippet (add any code snippets that support your topic, if applicable):

DEFAULT FOR PAY_EARN_PERIOD_END IS '2019/01/01' (DATE)

DEFAULT FOR PAY_EARN_PERIOD_START IS '2019/01/01' (DATE)

EFF_YEAR = TO_CHAR(PAY_EARN_PERIOD_END,'YYYY')

l_abs_start_date = PAY_EARN_PERIOD_START