Structure of driver/print program when it is to be linked to me21n in NACE

Question

Hi ABAPers,
what should be the structure of driver/print program  when it is linked to ME21N in NACE.
Like, when a Purchase Order is created in me21n and print preview is to be seen from ME21N and PO Number is passed to Driver Program.So, here what part of code imports or takes in values from ME21N.
--Dep

Answer 1

Hi,
Can you please tell me the flow of code. are you calling Me21n in your driver program via call transaction?
As I told you earliear Form routine is the entrance gate within a driver program for your PO.. Now after calling ME21n, You need to define a form routine. Name of the form rutine wud be same given in NACE..
In that Form routine, fetch all the data that have to be on Form layout. Here keep in mind.. you need to fetch the data form any table using NAST-OBJKY. This is a objeck key, Must be equal to PO number coming from Me21n screen..
After fetching the data, Call the smartform ....
I think i have covered all the things.. Pls try this..
Below is exple code..put after calling Me21n..
* FORM Entry Entry
form entry using return_code us_screen.
  clear w_lwbpt_flag.
  clear retcode.
  xscreen = us_screen.
  perform fetch_all_data. 
  perform call_smartform.
  if retcode ne 0.
    return_code = 1.
  else.
    return_code = 0.
  endif.
endform.
Regs,
Lokesh.