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Discussion Board for collaboration related to QlikView App Development.
The use of Pipe is to ensure that each value of Dimension_flag is separate from each other when you do a check. I would further change it to this may be
=SubStringCount(Concat('|' & Dimension_flag & '|', ','), '|3|')
Just to make sure that 3 can be differentiated from 13 because 13 also includes a 3.