SPI calculation..Urgent

I am trying to calculate the SPI for all possible cases using
Microsoft Project 2007.
The SPI calculation is working fine for the cases in which BCWP < BCWS
i.e. when SPI
is less than one..But for the cases in which BCWP > BCWS it is giving
the SPI as 1 and not greater than one..On close inspection i found
that in the resource usage table , watever extra work has been done on
a day is shifted to the next day..Thus if im setting my status date to
the current date , it is giving SPI equal to...

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