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When a Virtual column is set as List with the element type set as Ref it seems to correctly indicate there are 3 rows based on the App Formula BUT in the inline table it is displaying ALL rows from the referenced table. See the images below.
Full Expression Used in Virtual column
SELECT(PO Invoices[Vendor], TRUE)
Editor indicating temporary Virtual Column
Snapshot from browser view of app
If Switch column type to Text, only correct number of IDโs shown in list
I donโt know if anyone at AppSheet is actually tasked with monitoring the community for bug reports. I am not tasked with that, but do so because it seems like something I should be doing. 
When I see a bug that seems to be or has the probability of being a major problem, Iโll โescalateโ it internally by reporting it on an internal chat group that most of the technical staff follow (it seems to me). When I respond with โescalatedโ, it means Iโve mentioned the issue in an internal chat.
For issues that seem less severe, or that seem to be edge cases that I suspect will need deeper investigation, Iโll recommend contacting support@appsheet.com. The Support team (which may include developers) can then ask for whatever other information they need. In your case above, Iโd expect development will want access to a sample app that reproduces the problem.
Other than support@appsheet.com, Iโm not familiar with other means to engage support or report problems. My sense is that this #bugs-issues-errors category is not a particularly formal channelโbut I may be mistaken on that.
In general, my own personal guidance is to contact support@appsheet.com if the issue is urgent, complex, or you feel youโre owed a response because youโve given AppSheet money. Use the community if you have time to wait longer for a response, are looking for a workaround rather than an immediate fix, or just want to make others aware.
