Application Studio Data Rule - Invalid Token $

I have created a copy of an existing Data Rule, which contains a check against a row count in a dataview. The syntax for this is apparently $rowCount.

However, when I attempt to save I get this error message:
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Is there a way to fix this? I submitted a support ticket on this back in October 2022 for v2022.1, it was turned into PRB0256869 which is currently marked “Closed Complete”.

Right after posting I found a post from Devin about the same issue.

https://www.epiusers.help/t/rowcount-in-applicationstudio-data-rule

Apparently still in development? The PRB I referenced doesn’t seem to reflect that. Maybe there is another PRB out there for this?

To get around this, I have checked if one of the KeyFields is empty:

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Great idea, thanks Jonathan.