Abstract: Methods, systems, and computer program products for auditing transactions involving sales of tickets by one business entity for a travel product provided by another business entity. An application receives data including a fare basis and a fare charged for a ticket. A plurality of priceable units each consistent with an itinerary of the ticket and each including a fare corresponding to the fare basis is determined. Combinations of these priceable units that conform to the itinerary are defined, and a fare for each combination determined. The fare of each combination is compared to the fare charged for the ticket, and a matching fare selected. The rules used to price the selected combination are compared to the ticket and pricing context of the ticket, and errors in pricing the ticket determined based thereon. An agency debit memo may be defined based on errors in pricing the ticket and audit discrepancies.