Negative Value in Period Period Performance

Guys,

I got a negative value in my cumulative periode performance units. I grouped the activities by activity code. I have checked every single activity to find out if there is discrepancy between budgeted unit againts at completion unit (I kept the budgeted unit = at completion unit). But found nothing weird.

It happened when I did "Fill Down" during copy-paste  zero value  all the way down for each of the grouped activities . Anyone know how to solve it?

Thanks before hand for any helps!

 

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