该特性需要您用四个控制字段在外部系统创建一个表，这些字段用于识别和链接外部系统中的附件到Notes文档中的链接。
This feature requires that you create a table in the external system with four control fields that identify and link the attachment in the external system to the link in the Notes document.
LBAC安全性不能施加在外部表数据文件上。
LBAC security cannot be imposed on external table data files.
注意，在外部表创建之时，与该外部表关联的数据文件不需要存在。
Note that at the time of creating an external table, the data files associated with the external table need not exist.
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