Hi Folks,
creating conversion exits is quite simple. I just want to write down the procedure i use in the hope that it helps.
Suppose you have a field "NATSL" you want to create a conversion exit for.
1) Create an empty function group from se80
2) From se37 look up a couple of search exit functions that resemble what you need. In my case i find
CONVERSION_EXIT_GESCH_INPUT and CONVERSION_EXIT_GESCH_OUTPUT
3) Copy them to your function group changing the name to suite your conversion exit name. So you copy
CONVERSION_EXIT_GESCH_INPUT to CONVERSION_EXIT_NATSL_INPUT and
CONVERSION_EXIT_GESCH_OUTPUT to CONVERSION_EXIT_NATSL_OUTPUT
4) Adapt the coding ( you find it below). Basically the Input is always the same. The output module ( roughly speaking) receives the"code" and has to look up the "description". In this coding i do a select every time. Don't do this at home: do avoid it by buffering because these conversion exits are called very often.
One remark is that conversion exits have to be in the SAP namespace. you get a warning and you can save it.
If in the future SAP decides to release a conversion exit with the same name as yours the your work will be lost.
At the moment the only " solution " is to use really fancy names (ZZNAT? :-) )
I hope this helps.
Cheers
FUNCTION CONVERSION_EXIT_NATSL_OUTPUT .
*"--------------------------------------------------------------------
*"*"Interfaccia locale:
*" IMPORTING
*" VALUE(INPUT)
*" EXPORTING
*" VALUE(OUTPUT)
*" EXCEPTIONS
*" NOT_FOUND
*"--------------------------------------------------------------------
output = input.
data ls_t005t type t005t.
data lv_land1 type land1.
if input <> space.
lv_land1 = input.
select single * from t005t into ls_t005t
where spras = sy-langu AND
land1 = lv_land1.
if sy-subrc <> 0.
clear output.
else.
output = ls_t005t-natio.
endif.
endif.
endfunction.
FUNCTION CONVERSION_EXIT_NATSL_INPUT .
*"--------------------------------------------------------------------
*"*"Interfaccia locale:
*" IMPORTING
*" VALUE(INPUT)
*" EXPORTING
*" VALUE(OUTPUT)
*"--------------------------------------------------------------------
output = input.
ENDFUNCTION.