Aqui te dejo un ejemplillo de coger datos de las posiciones:
data:
lt_items TYPE purchase_order_items,
ls_items TYPE LINE OF purchase_order_items,
ls_item TYPE REF TO if_purchase_order_item_mm,
CALL METHOD im_header->get_items
RECEIVING
re_items = lt_items.
LOOP AT lt_items INTO ls_items.
ls_item ?= ls_items-item.
ls_mepoitem = ls_item->get_data( ).
*Aqui colocarias codigo para calcular lo que fuera
*en la variable ls_mepoitem llevas los valores de la ekpo
endloop.
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