sending screen filed data into an FM

hi all,

in a badi implemetation i'm using the FM 'RH_READ_INFTY_1001' .

CALL FUNCTION 'RH_READ_INFTY_1001'

EXPORTING

• AUTHORITY = 'DISP'

• WITH_STRU_AUTH = 'X'

PLVAR = '01'

OTYPE = 'S'

OBJID = '00000042'

ISTAT = '1'

• EXTEND = 'X'

SUBTY = 'A008'

• BEGDA = iPPHDR-begda "'19000101'

• ENDDA = iPPHDR-endda"'99991231'

• CONDITION = '00000'

• SORT = 'X'

• WITH_EV = ' '

• ADATA = 'X'

• AUTH_SOBID = ' '

TABLES

i1001 = it1001

• OBJECTS =

EXCEPTIONS

NOTHING_FOUND = 1

WRONG_CONDITION = 2

WRONG_PARAMETERS = 3

OTHERS = 4

.

I want to sent the BEGDA and ENDDA from the screen PPHDR (i'e. from transaction PP01 's begda and endda.)

How can do so.

TIA