Need help with NAV 2009 R2 Reports

drfsupercenter

I'm trying to edit the Purchase Order report to show a newly-added field in the header.

However, when I try to simply add it under Sections and then make a text box with it, I get this:


I notice that other fields in the header are called with formulas like this:

=Cstr(Choose(11,Split(Cstr(ReportItems!PageHeaderCaptions.Value),Chr(177))))

When I open Sales Order to compare, that one is much smaller:
=Code.GetData(17,3)

But in neither of these cases can I find the field name.

Additionally, I'm not sure if it's possible to only have the caption show up if there's data in the field. Simply creating a text box with the text wouldn't behave how I want it to.

Is there some easy way to do this without having to learn a whole new language?