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Abstract-A term of transaction which has its origin in database processing, representing a set of operations that must be performed all or none of them. The notion of transaction is also used in some business process modeling approaches such as the DEMO (Design & Engineering Methodology for Organizations) and the REA (resource-event-agent) value modeling approach. The DEMO's transaction forms a basic building block from which a business process is composed. The REA value modeling approach utilizes transactions in an REA model representing a business process. In general, both methodologies utilize the notion of transaction, which has, however, a different meaning in these approaches. The aim of the paper is to describe the basic models of both approaches and to show, with the 'rent-a-car' example, the principal differences between the notions of transaction between them. The paper also reflects on possible mutual collaboration between both approaches.

Abstract-Paired transactions or paired transfers have their origin in accountancy systems. The Resource-Event-Agent (REA) ontology uses paired transactions as a basic building block for business process modeling. A business process (REA model) is composed of two sets of paired transactions. REA itself originates from accountancy systems and has gradually developed into a full-fledged information system framework. REA model used to be depicted by ER diagrams and later by UML class diagrams. However, both these diagrams were not designed to capture conceptual models which are more precise, comprehensible for domain experts and easily to modify. ORM (Object Role Modeling) represents approach to conceptual modeling which fulfils above mentioned requirements. The main goal of the paper is to derive and describe the ORM model of paired transactions which corresponds to REA exchange model and assess this approach.