Ability to mix/match OM Transaction Types with and without accounting rules resulting in 1 invoice

Oracle 12.2.4. 2 OM Transaction Type setups. Both have an invoicing rule (Advance) but one OM Transaction Type with an accounting rule and the second one with no (blank) Accounting Rule.

We do know that autoinvoice uses the acounting_rule_id as mandatory parameter. Our goal is to invoice items together that are a subscription and non-subscription.

The invoicing_rule_iddrives the accounting process by defining when the revenue is recognized, either "Bill in Advance" or "Bill in Arrears." Mixing lines with different rules would complicate the creation of revenue schedules, as the system needs to post them to the appropriate revenue accounts at different times.