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?（）A It is created as a nondisplay item. B The Lock Record property is set to Yes. C
题目
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?（）
A
It is created as a nondisplay item.
B
The Lock Record property is set to Yes.
C
It cannot be referenced in item level triggers.
D
It is placed on the canvas with the highest sequence number.