Purchase requisition, user-exit before save

Question

Hi,
my need is very simple, when i save my purchase requisition i need to access in modification to items (standard fields) of my document.
I'm looking for a few days on SDN or Google but without success, the question has often been discussed but the answers are not accurate or some people say "try this or this" but it doesn't work.
There was an answer to use the Badi ME_PROCESS_REQ_CUST, but all these methods do not suit me. Some people proposes to use the method PROCESS_ITEM or POST. For the first i need to work with global items not line by line and in the method POST i do not have access to lines.
So can you help me ?
Cheers.

Answer 1

>
Vinod Kumar wrote:
> Explore the options available in badi ME_PROCESS_REQ_CUST (check methods CHECK & POST).  In both these methods, importing parameter IM_HEADER (type ref to IF_PURCHASE_REQUISITION) can be used to extract all PR related data. See interface method IF_PURCHASE_REQUISITION->GET_ITEMS for item level information.
>
> I would suggest you to search for available Wiki pages/ forum posts to get more information.
Hi Vinod,
thanks for your reply.
I found this wiki http://wiki.sdn.sap.com/wiki/display/ABAP/AccessingtheInacessible-LocalClasseswithinGlobalClasses
I need some help, i would like in method POST change items data (standard), i don't have some success.
My code :
METHOD if_ex_me_process_req_cust~post.
  DATA: l_item_list TYPE mmpur_requisition_items,
      l_item      TYPE mmpur_requisition_item,
      l_item_akt  TYPE mereq_item,
      l_item_ref  TYPE REF TO if_purchase_requisition_item,
      lo_obj      TYPE REF TO object,  " root object
      ld_attr     TYPE string.
  FIELD-SYMBOLS:
    <lo_lcl>        TYPE ANY,
    <ls_item>       TYPE mereq_item,
    <ls_itemx>      TYPE mereq_itemx,
    <item>          TYPE mmpur_requisition_item.
  " Get items of purchase requisition
  l_item_list = im_header->get_items( ).
  LOOP AT l_item_list ASSIGNING <item>.
    l_item_akt = <item>-item->get_data( ).
    l_item_ref = <item>-item.   " TYPE REF TO if_purchase_requisition_item
    l_item_akt-afnam = sy-uname.
    <item>-item->set_data( l_item_akt ).
  ENDLOOP.
  l_item_list = im_header->get_items( ).
ENDMETHOD.