During Intra polation system is picking MR Difference for calculation. instead of Actual Consumption

Hello Experts,

During Intra-Polation, system is calculating according to MR difference, ignoring Applied Billing Factor or Register Factor. When MR difference is intrapolated, due to rounding of fractions and then multiplication of intrapolated MR's with factors are giving a Huge Difference in Billing.

Experts please suggest us how to Pick Actual/Forced Consumption for Intrapolation process.