Incorrect Charge for a Rate Change Scenario With Cycle Forward Event (Doc ID 2835330.1)

Last updated on SEPTEMBER 26, 2023

Applies to:

Symptoms

Consider this scenario:

1. In ~/cm/pin.conf, set:

#========================================================================
# rate_change
#
# Enables or disables the enhanced rate change management feature.
#
# If this feature is enabled then rate changes for cycle events
# in the middle of the cycle will be handled according to old and
# new rates prorated. If disabled only the old rate will be applied
#
# 0 = (Default) Disable enhanced rate change management feature.
# 1 = Enable enhanced rate change management feature.
#
#========================================================================
- fm_subscription rate_change 1

2. Create product A with two tiers rate:
    Tier 1: Oct 21, 21 ~ Jan 1, 22 = $ 0.00
    Tier 2: Jan 1, 22 ~ Never Ends = $ 0.77

3. On Nov 17, purchase product A for the account with Billing Day of Month (BDOM) set to 18. The charge (Nov 17, 21 ~ Nov 18, 21) is $ 0.
4. On Nov 18, run billing. The charge (Nov 18, 21 ~ Dec 18, 21) is $ 0.
5. On Dec 18, run billing. Two charges (Dec 18, 21 - Jan 01) is $0, and (Jan 1, 22 - Jan 18, 22) is $ 0.77.

Expectation:
========
0.77 * 0.422258064516134(scale) = 0.548387096774200

Cause

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