Business Intelligence Acceptance Fear

I will not accept the testing results. Why, because it has minor differences. I do not know causes differences and I do not know how to interpret them? If I accept now, who can guarantee that future business intelligence loads will be also good? Have you installed checkers deep into Information Systems? Reporting logic must not be harmed… Your business intelligence reports must act same as my manually adjusted table calculators. Can you program it? What if reports will generate error in future and I will not recognize error?

I will still not accept reports…

This is just small portion of fear that users experience during business intelligence testing period.