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HeliJon
Sorry you've not had any replies yet. I'm a recent addition to the volunteer team and just going round looking for unanswered posts and spotted yours.
So, I'm assuming you put your reading correction in manually, and did this just after the price changes?
As they generate automated bills or corrections to bills from the meter reading you submit, there's no human process involved in trying to attribute particular consumptions to particular periods.
I've had fun and games myself with this, but I always find the best way is to never submit a meter reading to cover a longer time than perhaps a month or two and never go over the boundary of a price change. Whether Eon allow you to submit retrospective readings, as in readings that predate your latest one, I'm not sure, but it may be possible to split your correction over a few months and enter readings one at a time in sequence.
Say I'd been estimated a few months at 10 units a month between August and October, but my actual consumption was 1000. Rather than put a 970 correction in at the start of October and get caught at the higher rate, I would have tried to enter three separate readings of around 320 or so but date each reading August sometime, September sometime and October sometime.
But, I've just checked and the furthest you can backdate a meter reading entry is nine days.
Maybe too late for you now, but worth remembering when it comes to April.