在弹出窗口中显示带checkbox的
发现一个很方便的ALV函数REUSE_ALV_POPUP_TO_SELECT，通过这一个函数就可以实现在弹出窗口中显示带checkbox的ALV。
完整代码如下：
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REPORT z_popup_alv.
TYPE-POOLS: slis.
TABLES: spfli.
*--------------------------------------------------------------*
*Data Types
*--------------------------------------------------------------*
TYPES: BEGIN OF ty_spfli,
check TYPE c.
INCLUDE TYPE spfli.
TYPES: END OF ty_spfli.
*--------------------------------------------------------------*
*Data Declaration
*--------------------------------------------------------------*
DATA: gt_spfli TYPE TABLE OF ty_spfli.
DATA: gwa_spfli TYPE ty_spfli.
DATA: gwa_selfield TYPE slis_selfield.
*--------------------------------------------------------------*
*Selection-Screen
*--------------------------------------------------------------*
SELECT-OPTIONS: s_carrid FOR spfli-carrid.
*--------------------------------------------------------------*
* Start-of-selection
*--------------------------------------------------------------*
START-OF-SELECTION.
CLEAR: gwa_selfield.
**Get data
SELECT * FROM spfli INTO CORRESPONDING FIELDS OF
TABLE gt_spfli.
**Remove duplicates
DELETE ADJACENT DUPLICATES FROM gt_spfli COMPARING carrid.
CALL FUNCTION 'REUSE_ALV_POPUP_TO_SELECT'
EXPORTING
i_checkbox_fieldname = 'CHECK'
i_tabname = 'GT_SPFLI' " Internal table name
i_structure_name = 'SPFLI'
IMPORTING
es_selfield = gwa_selfield
TABLES
t_outtab = gt_spfli " Internal table which contains entries
EXCEPTIONS
program_error = 1
OTHERS = 2.
REFRESH s_carrid.
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运行，
ALV中的checkbox可以复选，所以本函数也可以用在F4 help上，允许用户选择多条数据作为选择画面的筛选条件。
