ABAP查询界面日期范围未选择值，则查询前一天的数据

包含TOP的查询条件：

SELECT-OPTIONS: p_bldat FOR ekbe-bldat . "凭证日期

包含FORM的代码：

RANGES: date_range FOR ekbe-bldat.

IF p_bldat[] IS INITIAL.
    date_range-sign = 'I'.
    date_range-option = 'BT'.
    date_range-low = sy-datum - 1.
    date_range-high = sy-datum.
    APPEND date_range.
ELSE.
    date_range =  p_bldat.
    APPEND date_range.
ENDIF.

SELECT ebeln,ebelp,gjahr,belnr,buzei,bldat,dmbtr
      INTO TABLE @DATA(lt_ekbe)
      FROM ekbe FOR ALL ENTRIES IN @lt_ekpo
      WHERE ebeln = @lt_ekpo-ebeln
        AND ebelp = @lt_ekpo-ebelp
        AND bwart = '101'
        AND bldat IN @date_range.
SORT lt_ekbe BY ebeln ASCENDING ebelp ASCENDING bldat DESCENDING.