eQL for displaying containers with a "Warning" (Missing Mandatory data)

Happy Christmas everyone!

I would like to construct a System Report that returns documents (containers) that have a "Warning" message that an item of mandatory metadata is missing. The "Warning" appears in orange-coloured font on a container's front screen, and prevents a user from Approving a container. Is this possible? If so, I'd be extremely grateful for any assistance on the eQL required.

Many thanks!

Chris