I have two dropdown lists on HTML screen and only one is required. Works fine if I enter both parameters otherwise I get;
"RESULT OF EXPRESSION IS NOT COMPATIBLE WITH THE FORMAT OF FIELD".

When I run the fex manually, it works fine.

This message has been edited. Last edited by: <Kathryn Henning>,

You will need to post your fex code so we can help. Also, how are your dropdowns setup? Are you using a 'no selection' value or what?