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I have a request I've never seen prior to this. Let me preface this by stating that I do know how to create custom symbols to use with repeat regions (BOM reports). The request I've gotten is to have a balloon that shows the index number in the top half of the balloon, with the bottom half reserved for text where the user may enter anything he wishes.
The documentation focuses on data mining from the repeat region attributes, but I can't find any mention of a custom balloon symbol with both data driven text and entry driven text.