FINDING REASON CODE

Question

I would like to write subroutine for display reason code ( BSAK-RSTGR ) into my layout set.
my function consultant instruct me you should pick the data based on following business logic.
Payment Document Number (REGUP-VBLNR ) equal to clearing document number ( BSAK-AUGBL) .
i have written my code as follows .
FORM  ZREASONCODE TABLES in_tab structure itcsy
                      out_tab structure itcsy.
TABLES: REGUP, BSAK.
DATA:  A_VBLNR TYPE REGUP-VBLNR,
       B_RSTGR TYPE BSAK-RSTGR.
READ TABLE IN_TAB INDEX 1.
CHECK SY-SUBRC = 0.
A_VBLNR = IN_TAB-VALUE.
SELECT SINGLE RSTGR FROM BSAK INTO B_RSTGR WHERE AUGBL = A_VBLNR.
IF SY-SUBRC = 0.
READ TABLE OUT_TAB INDEX 1.
IF SY-SUBRC = 0.
OUT_TAB-VALUE = B_RSTGR.
MODIFY OUT_TAB INDEX 1 TRANSPORTING VALUE.
ENDIF.
ENDIF.
ENDFORM.
but no data is picking above logic .
can some one guide me how to pick up data for above logic.
pls suggest me i will reward the points.

Answer 1

Hi,
After reading a value from in_tab is is often a good idea to run function module CONVERSION_EXIT_ALPHA_INPUT to convert the display format held in the SAPscript to internal format before using it to read a database table.
Regards,
Nick