I have a Layout region that has two fields. The first field is Editable, Number and percent. The second field is computed from a dialog box, multivalued, Number and percent. I want to have a field that will total both fields and then do a validation to make sure that it equals 100%. I have the formula @Sum(Field2), when I open the form I get the error message Incorrect Data Type for operator or @function Number expected. What am I missing?