How to select middle rows in HR ABAP

Hello Masters,
I am new to ABAP-HR i want to know say suppose we have 4 rows in over-view of an employee in infotype "Organizational assignment" in PA30, i know how to select the first and the last row but i want to know how to select the middle rows for ex : if i want to fetch the previous desigantion of an employee which is on the 2nd row everytime when i run my program.
CALL FUNCTION 'HR_READ_INFOTYPE'
   EXPORTING
     pernr                 = a_pernr
     infty                 = '0001'
    begda                  = sy-datum
    endda                  = sy-datum
   TABLES
     infty_tab             = it_pa0001
EXCEPTIONS
infty_not_found       = 1
OTHERS                = 2.
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
READ TABLE it_pa0001 INTO wa_pa0001 INDEX 1.
IF sy-subrc = 0.
ENDIF.
from Index 1 i am able to fetch the last action run on employee but how can i select the 2nd last action run on employee.

I'm not sure if i am getting your point, but if you use HR_READ_INFOTYPE and BEGDA and ENDDA are set using the current date, you'll only get the active record(s) of your employee. If you want to get all records just don't use BEGDA and ENDDA in the FM and you will get all the records for that employee no matter what dates are they active in.
All the records are sorted by BEGDA so the last one would be the last action run. If you want to get the previous assignment you can sort the internal table in the opposite order and get the second row.
sort it_pa0001 by begda descending.
READ TABLE it_pa0001 INTO wa_pa0001 INDEX 2.

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