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They can break things, not allow the points to update or refresh when viewing. You can use the /wiki/spaces/FINFrameworkV101/pages/772803012Search and Replace feature to mass remove those special characters.
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Sometimes customers might remove one of the needed tags for points. Each point has to have either sensor, sp, or cmd tag. If you have more than one of those, you can use this tool to fix it: /wiki/spaces/FINFrameworkV101/pages/772802942Fix Conflicting Tags.