Thanks, I will try and test this as soon as I can.

I am still not following this format:

${E:A:values{extattrs}{R7_Site}{value}}

Compared to this one in my edit when I tried to fix my problem alone:

${E:A:ip.extattrs{R7_Site}}

If I'm looking at these directly, in the first example, I'm not sure how to parse this.

In the second example, ip.extattrs is an existing list in the E namespace and it's pulling the value for R7_Site "as-is".

I'd just like to make sense of what the first format is doing and why it is is used in the template, and why the second format would be wrong to use in it's place?