存储域(Domain)信息的表为DD01L；存储数据元素(Data Elements)的表为DD04L；存储SAP表信息的为DD02L；DD03L存储Table Fields。
DD01L的LOWERCASE字段决定是否数据会全部转换成大写
另：如何访问SAP的Domain的Value Range
1.直接访问透明表dd07l和dd07T
select * from dd07l
where domname = 'domname' and
as4local = active.
2.使用函数
call function 'DD_DOMVALUES_GET'
exporting
domname = p_domname
importing
rc = l_subrc
tables
dd07v_tab = l_dd07v
exceptions
wrong_textflag = 1
others = 2.
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