Interesting find. I wonder how far back it goes. Maybe it has always been there and never implemented? Or maybe a legacy field from an old version. They usually tell you that. (I think there’s an old lock PO setting on the PO header that got moved to the releases, etc.)
Like the Operation table (or maybe resource group) has a TAKT time field and a prior GM here was excited about that but it turns out it does nothing as it was never implemented.
That and the reprint-PO setting of “Fred” is my favorite DMT gem.