Sum of percent

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?
shabalaAsked:
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ghassan99Commented:
@If(Field2!="";@Sum(Field2);"");
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shabalaAuthor Commented:
Thanks, worked great.

Jen
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