Pay calendar in HR ABAP

Question

Hi ABAP    GURU,
                          My question is regarding inbound interface where I have to retrieve the begin date of employee in accordance to interface trigger date.
                       How can I get the begin date (BEGDA) of employee based on the WEEKLY and MONTHLY  payroll using PAY CALENDAR.
EX:WEEKLY PAYROLL
       interface  trigger date- 01/03/2011(MM/DD/YYYY)
       begin date                   - 12/26/2010(MM/DD/YYYY)
EX:MONTHLY PAYROLL
       interface  trigger date- 01/03/2011(MM/DD/YYYY)
       begin date                   - 01/01/2010(MM/DD/YYYY)

Answer 1

Table T549Q has payroll period start and end dates. Use employee payroll area P0001-ABKRS and get PERMO from T549A using this. Get payroll dates from T549Q using PERMO