How can the system ensure that users check all the available lists? If any of them are left unchecked, the column value will be invalid. Is that possible? Thank you
ISBLANK(LIST(//expression to list possible items//) - [_THIS])
Hey @TeeSee1 thanks for your response,
But it doesn't work at all. Here is my formula:
A SELECT statement returns a list. So you do not need the first LIST.
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