There is no known difficulty calling LabVIEW 7.0 code from TestStand 2.0 or 2.0.1. You should be able to use the TestData and ErrorOut output parameters as you did in previous versions of LabVIEW. Mass compiling all VIs to LabVIEW 7.0 will save conversion time each time you work with one of the TestStand controls in LabVIEW but is not required.
--Regards
Elaine R. National Instruments http://www.ni.com/support