In Revenue Cloud's billing hierarchy, the Order Product level Billing Treatment takes precedence over the Product Level Billing Treatment. According to Revenue Cloud billing documentation, when a Billing Treatment is configured at multiple levels, the system applies a priority hierarchy where the most specific (transactional) level overrides more general levels.
The Billing Treatment field configures whether a charge should be billed in advance (prior to service delivery) or in arrears (after service delivery). When this setting exists at both the Product level and the Order Product level, the Order Product level configuration is the final determining factor. In the given scenario, even though the Product is configured to bill in arrears, the subscription order will actually bill in advance because the Order Product Billing Treatment explicitly specifies advance billing.
This design allows for customer-specific exceptions and flexibility. The Product level provides a default billing behavior, but sales teams and billing administrators can override this default at the Order Product level for specific deals, negotiated terms, or unique customer arrangements. For example, a customer might negotiate different billing terms than the standard product defaults, and those specific terms are captured at the Order Product level during quote-to-order conversion.