遇到个问题，关于select语句存取到情况，导致结果不同：写法1：
loop at itab0.
select matnr kalnr cpudt from keko
into (itab-matnr,itab-kalnr,itab-cpudt)
where matnr = itab0-matnr
and werks= \'1000\' and kalka= \'01\' a ...
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