Interface date calculation

Summary:

In the Subscription documentation - https://docs.oracle.com/en/cloud/saas/subscription-management/fasum/how-interface-date-and-invoice-date-is-calculated-in-the-billing-summary.html#u30240288

The following logic to calculate the Interface Date and Invoice date

Interface date is populated with the date that is higher between sysdate and invoice date .

Invoice date for Arrears Invoice + Billing date period start ---> Billtodate+1

Invoice date for Arrears Invoice + Billing date period start --> Billtodate

Invoice date for Arrears Invoice + Billing date: day --> the day of the month after bill to date

Invoice date for Arrears Invoice + Billing date: offset --> Billtodate+1 + offset (number of days)

Invoice date for Advance Invoice + Billing date: period start -> Billfromdate