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Does xtoverid need "vce(robust)" option?

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Does xtoverid need "vce(robust)" option?

Jongho Park
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I'm trying to do a robust Hausman test for heterogeneity and serial correlation.
I wonder whether I have to add "vce(robust)" option to xtreg command.
Which one is correct for Grunfeld data?

1)
xtreg inv  value capital, fe
xtreg inv  value capital, re
xtoverid

2)
xtreg inv  value capital, fe  vce(robust)
xtreg inv  value capital, re vce(robust)
xtoverid

The results are different each other.
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