（单选题）
You create a data block based on a relation table containing a REF column. You select the REF column for your form module. Which statement about the REF column is true?（）
AIt is created as a nondisplay item.
BThe Lock Record property is set to Yes.
CIt cannot be referenced in item level triggers.
DIt is placed on the canvas with the highest sequence number.
正确答案
答案解析
略
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