A change in rate schedule does not cause price proration, but rather calculation period proration, which is a different process that splits the bill segment into sub-segments based on the effective dates of the rate versions. A change in bill factor alone does not cause price proration, unless it is associated with a calculation rule that also changes during the bill period.
Change in Rate Schedule only: A change in rate schedule does not cause price proration, but rather calculation period proration, which is a different process that splits the bill segment into sub-segments based on the effective dates of the rate versions.
References:
Effective Dates and Price Proration
Calculation Period Proration
Consumption Period Proration