Select single 优化
READ TABLE LT_KONP INTO LS_KONP WITH KEY KNUMH = LO_KNUMH . IF SY-SUBRC = 0. POUT_KBETR = LO_KBETR. ELSE. SELECT SINGLE KBETR FROM KONP WHERE KNUMH = @LO_KNUMH INTO @LO_KBETR. LS_KONP-KNUMH = LO_KNUMH. LS_KONP-KBETR = LO_KBETR. APPEND LS_KONP TO LT_KONP. CLEAR LS_KONP. POUT_KBETR = LO_KBETR. ENDIF.