Constrained by list empty

I noticed something curious today when I wanted to adjust a reference set in a form in Mx 5.21.1. The constrained by was totally empty. I could work around it by creating an XPath but I was wondering what influances the constrained by list. Anybody else noticing this? Regards, Ronald
1 answers

The situations in which the constrained by setting applies are rather specific, so it's entirely possible your scenario varies slightly from what is required. The documentation does a pretty good job of explaining the details: