Delivery Address in Purchase order Create ME21N

Question

Hello all,
     I am trying to capture the value in the Country field on the Delivery Address tab when creating a PO (ME21N).  We only want to write a certain condition if the Vendor is non-US and the Delivery country is US. 
     The initial value is populated in KOMK but it doesn't change if the Delivery address is changed manually. 
We are using subroutine KOBEV_600 in Include RV61A600.  I tried using GET PARAMETER ID 'LND' but it never worked.  It always came back blank. 
Thanks for any help.
Kind regards,
Chris Mowl

Answer 1

Thank you for the responses although they didn't quite address my issue. 
The solution we are testing at the moment is using the following code in User Exit ZXM06U14:
DATA: lv_country TYPE land1.
IF i_ekpo-adrn2 IS NOT INITIAL.
  SELECT SINGLE country FROM adrc
  INTO lv_country
  WHERE addrnumber = i_ekpo-adrn2.
  IF sy-subrc = 0.
    EXPORT lv_country TO MEMORY ID 'adrn2'.
  ENDIF.
ELSEIF i_ekpo-kunnr IS NOT INITIAL.
  SELECT SINGLE land1 FROM kna1
  INTO lv_country
  WHERE kunnr = i_ekpo-kunnr.
  IF sy-subrc = 0.
    EXPORT lv_country TO MEMORY ID 'adrn2'.
  ENDIF.
ELSE.
  CLEAR lv_country.
  EXPORT lv_country TO MEMORY ID 'adrn2'.
ENDIF.
When an Address number or Customer number are filled in on the "Delivery Address" tab for the item, they are filled in the i_ekpo-adrn2 or i_ekpo-kunnr fields respectively.  I then export the country value to memory and import it in RV61A600 where we check that value.