EDM meter exchnage

Plz help me how to handle the meter exchange for an interval meter. This meter is a cumulative interval meter. What I have done

a) Entered the cumulative reading for old meters in the profile.

b) Carried out the meter exchange

c) Enter the cumulative reading for the new meter

I then created formula profiles which will convert the reading to consumption. This formula calculation is not considering the meter exchange. The calculation is carried-out as if there is no exchange happened for the meter and it has given me the wrong consumption.

can you plz tell me how the exchange of cumulative meters with interval reading are handled normally

Thanks and regards,