Hi,
You cannot use the callback VIs directly in TestStand. Information about LabVIEW TestExecutive compatibility with TestStand is available in a help file called LVTECompatibility.hlp which is located in your \Doc.
Below is the relevant text from the help file:
You cannot use Sequence callback VIs from the LabVIEW Test Executive in TestStand. TestStand, however, handles callbacks in a similar and more flexible way. For more information on the TestStand callback capabilities and process models, please refer to the TestStand User Manual.
All converted LabVIEW Test Executive sequences use the TestStand default model sequence, TestStandModel.seq to provide sequence callback functionality.
Anand