BDC setting Parameter value To 'X'

Question

Hi gurus,
my custom program runs a BDC to trigger standard T.code .In the program of Transaction code there was parameter field
Parametrs:p_xfield type rkkzest-info NO-DISPLAY.
i want to set the P_xfield to "X" by field name p_xfield and fval as "x'
  when i am doing  and setting the value to X  there was an eror message.
Is there any process to set .
I want to set the variable to "X' basing on that entire validation goes,please provide me the help.
Regards,

Answer 1

HI try as given below
This is for SE38 tcode, u have to modify the statement in bold to meet ur requirement.
assign value of your select option to X.
<b>WA_BDCDATA-PROGRAM  = 'SAPMS38M'.
WA_BDCDATA-DYNPRO   = '0100'.
WA_BDCDATA-DYNBEGIN = 'X'.</b>
APPEND WA_BDCDATA TO BDCDATA.
CLEAR WA_BDCDATA.
<b>WA_BDCDATA-FNAM     = 'RS38M-PROGRAMM'.
WA_BDCDATA-FVAL     = PROGRAM.
APPEND WA_BDCDATA TO BDCDATA.</b>
CALL TRANSACTION 'SE38'  USING BDCDATA  MODE 'N'
                         MESSAGES INTO ITAB.
reward if helpful*