Fetching data from COOIS Tcode

Hello Experts,

I want to fetch data from COOIS tcode in program and display it.

Code-

IF s_werks IS NOT INITIAL.
APPEND VALUE #( selname = 'S_WERKS'
kind = 'S'
sign = 'I'
option = 'EQ'
low = s_werks-low
high = '' ) TO t_parameters.
ENDIF. " IF s_werks IS NOT INITIAL


IF s_begda IS NOT INITIAL.
APPEND VALUE #( selname = 'S_TERST'
kind = 'S'
sign = 'I'
option = 'BT'
low = s_begda-low
high = s_begda-high )
TO t_parameters.
ENDIF. "

wa_tcoa-opcomp_sel = abap_true.
wa_tcoa-layoutid_de = '000000000001'.
CALL FUNCTION 'COIS_SELECT_PARAMETERS_SET'
EXPORTING
it_parameter = t_parameters[]
is_tcoa = wa_tcoa.

* select data from IOC
* read production orders
CALL FUNCTION 'COIS_SELECT_ORDERS_READ'
CHANGING
ct_ioopcomp = t_opcomp_tab[].

When I pass plant only as selection it is working fine, however when i pass Scheduled Start date, it is not returning any data. Can anybody please let me know how pass date to COOIS Tcode?

If I pass same parameters to COOIS Tcode, it is returning values!

Thanks in advance.