选择屏幕分2种, 单选 parameters , 多选select-options.
比如: parameters: p_werks LIKE ekpo-werks,
select-options: s_matnr for ekpo-matnr.
select *
into table lt_itab
from ekpo
where werks = p_werks
and s_matnr in s_matnr.
单选等于, 多选 IN
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