After more searching in the Reporting Community Discussions, I found
this post by Melinda Layten that solves my issue! Thank you MELINDA! For
custom form fields, the syntax is {DE:Field Name}, or, if you use the
same field on multiple forms like we do, add the necessary table in
front like this: {program}.{DE:Field Name} Posted 07-24-2017 13:28 Reply
to Discussion Options Dropdown valueexpression and the {}.{} syntax are
your friends here: group.0.displayname=Concat
group.0.valueexpression=CONCA...