The built-in Web Report Studio table objects do not support creating conditional highlighting rules based on hidden columns. You must either include the flag column in the table, or write a stored process to create the table instead of using the built-in table objects. The stored process must conform to the guidelines in this SAS Note:
http://support.sas.com/kb/47/839.html
Note that Visual Analytics does enable you to create expression-based display rules for columns that are not visible in the table.
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