Iam not getting the data on screen after using the user exit zxpadu01

Question

Dear Freinds
            As per my requirement when the user enters value Ansal  it should get defaulted to Amount field (bet01 ) based on the wage type
i have written calculation ( q0008-bet01 = ansal/100) before it getting defaulted to bet01, i found that value is not getting default  on the screen for bet01 once i enter value for Ansal , please any body correct my code
in   ZXPADU02 i have written the code as  below :
data : wa_p0008 like p0008,
        i0008 like p0008,
       l_v_ANSAL type ANSAL_15,
       l_v_amount type PAD_AMT7S.
CASE innnn-infty.
when '0008'.
CALL METHOD cl_hr_pnnnn_type_cast=>prelp_to_pnnnn
EXPORTING
prelp = innnn
IMPORTING
pnnnn = wa_p0008.   -- HERE I GOT ALL THE DATA EXCEPT BET01
if wa_p0008-lga01 = 'MFPY'.
l_v_ansal =  wa_p0008-ansal.
l_v_amount = l_v_ansal / 100.
move l_v_amount to wa_p0008-bet01.
CALL METHOD cl_hr_pnnnn_type_cast=>pnnnn_to_prelp
EXPORTING
pnnnn = wa_p0008  --- HERE I CAN SEE EVEN THE BET01 IS FILLED
IMPORTING
prelp = innnn.         --- HERE I CAN SEE LGART BUT NOT AMOUNT VALUE
endif.
when others.
endcase.
IN ZXPADU01 I HAVE WRITTEN AS BELOW:
data : wa_p0008 like p0008,
        i0008 like p0008,
       l_v_ANSAL type ANSAL_15,
       l_v_amount type PAD_AMT7S.
CASE innnn-infty.
when '0008'.
MOVE-CORRESPONDING  innnn to wa_p0008.
CALL METHOD cl_hr_pnnnn_type_cast=>prelp_to_pnnnn
EXPORTING
prelp = innnn
IMPORTING
pnnnn = wa_p0008.
if wa_p0008-lga01 = 'MFPY'.
l_v_ansal =  wa_p0008-ansal.
l_v_amount = l_v_ansal / 100.
move l_v_amount to wa_p0008-bet01.
CALL METHOD cl_hr_pnnnn_type_cast=>pnnnn_to_prelp
EXPORTING
pnnnn = wa_p0008   --- I CAN SEE ONLY WHEN I COME AGAIN
IMPORTING
prelp = innnn.
endif.
when others.
endcase.
Now my problem is as follows :
               i have entered the value for Ansal (ex: p0008-Ansal = 1000) ..........and i say enter then i should found the calculated value for the ansal through my coding
and it should  display in bet01 as 10 ( q0008-bet01 =  p0008-ansal /100)
but i dont find the value 10 being displayed for the field bet01 on the screen  when
user enters Ansal  as 1000 .........even then i have saved it to test the scenario......
now i came in displayed mode (pa20 ) for the infotype 008 for the same personnel no for the same  dates .....where i created the record........i found that the value
bet01 is there i.e i can see  the value bet01 as 10 ( my requiremnt here matching)
but when the user say enter during the time of creation of the record the value
bet01 is not getting defaulted with 10 .........why iam not able to understand
PLEASE ANY BODY HELP ME IN THIS REGARD 
regards
shanti.

Answer 1

Hi Pranesh,
               i have used the logic which you hav given as below
in ZXPADU02
  FIELD-SYMBOLS <fs>  TYPE ANY.
ASSIGN ('(MP000800)Q0008-betrg') TO <fs>.
if <fs> is assigned.
<fs> = l_v_amount .  ---  amount as (ansal /100 i.e 1000/100 = 10) 10
endif.
still iam not getting the data for the field bet01
this is the coding i am using
data : wa_p0008 like p0008,
        i0008 like p0008,
       l_v_ANSAL type ANSAL_15,
       l_v_amount type PAD_AMT7S.
  FIELD-SYMBOLS <fs>  TYPE ANY.
CASE innnn-infty.
when '0008'.
MOVE-CORRESPONDING  innnn to wa_p0008.
CALL METHOD cl_hr_pnnnn_type_cast=>prelp_to_pnnnn
EXPORTING
prelp = innnn
IMPORTING
pnnnn = wa_p0008.
if wa_p0008-lga01 = 'MFPY'.
l_v_ansal =  wa_p0008-ansal.
l_v_amount = l_v_ansal / 100.
move l_v_amount to wa_p0008-bet01.
ASSIGN ('(MP000800)Q0008-betrg') TO <fs>.
if <fs> is assigned.
<fs> = l_v_amount .
endif.
CALL METHOD cl_hr_pnnnn_type_cast=>pnnnn_to_prelp
EXPORTING
pnnnn = wa_p0008
IMPORTING
prelp = innnn.
endif.
when others.
endcase.
please help me as iam still not getting (value in bet 01) when i press enter once i enter value in ansal feild.
regards
shanti.