ReadOnlyRecommended not a valid field for Project Server?

[jkormann]

Trying to follow-up Eric H's question: Is the ReadOnlyRecommended flag a
valid flag for Project files stored on MS Project Server (SharePoint)? From
some brief testing, it doesn't seem to be. I was able to create a new project
and with VBA, save it to MS Project Server

CurrentProject.SaveAs(Name:="<>\TestSave", ReadOnly:=True)

Checking it's state after retrieving, it's not being marked as ReadOnly and
there was no prompting when it was opened.

Was I doing something incorrect?

Thank you.