1. MM_CURRENT_PRICE_DOCUMENT
2. ME_READ_HISTORY 获取采购行项目的历史记录
CALL FUNCTION 'ME_READ_HISTORY'
EXPORTING
ebeln = ekpo-ebeln
ebelp = ekpo-ebelp
webre = ekpo-webre
TABLES
xekbe = bet
xekbz = bzt
xekbes = bets
xekbez = betz
xekbnk = xekbnk.