it’s just not possible (..yet.. VAMOS might change that a little)
so i would first suspect a KPI issue :
– check the formula,
– check how it is aggregated,
– ensure you’re looking at hourly values and not daily values (sorry! have to be sure),
– check the raw data and counters definition,
– check that all raw data are properly retrieved by OSS.
If all this is correct, then open a fault report to the vendor.