This document would give in formation on how to access or change the PO item data before save using different methods.
Create implementation for BADI ME_PROCESS_PO_CUST
go to Method PROCESS_ITEM(This method can be used to change the Item)
DATA:
Flg_pers type c,
ref_pohdr TYPE REF TO if_purchase_order_mm,
wa_pohdr TYPE mepoheader,
wa_item TYPE mepoitem,
wa_pitem TYPE mepoitem.
* This method can be used to get referance(Pointer) for header data
ref_pohdr = im_item->get_header( ).
* Read header data from above referance
wa_pohdr = ref_pohdr->get_data( ).
* im_item of PROCESS_ITEM can be used as a referance to get item data
wa_item = im_item->get_data( ).
* IS_PERSISTENT can be used to check whether item is already created or it is nw entry
flg_pers = im_item->is_persistent( ).
* We can apply logic for only new items
IF flg_pers IS NOT INITIAL.
EXIT.
ENDIF.
* in this example I am modifying GR indicator for few conditions
IF wa_pohdr-ekorg EQ '1001' AND wa_item-knttp = 'F'.
wa_item-wepos = space.
im_item->set_data( EXPORTING im_data = wa_item ).
ENDIF.