are you looking for the name of the customer on the invoice? you'd want to use just 'entity', and then if you need the text of the name you can do getText on entity. there are some fields that are seen in the field explorer/XML that are just for display purposes and aren't actually accessible via script.

hey, thank you, that was it -- it led me to what I needed. Now it makes sense why it's not in the records schema but makes it into the field explorer. Again, thank you.