Abstract: A respective transaction associated with at least one business object is initiated on behalf of each of a plurality of users during an interaction phase. Subsequently, an optimistic lock to the business object is assigned to each user during pendency of the corresponding transaction upon modification of at least one node of the at least one business object. An exclusive lock is then assigned to the at least one business object to a first user that first completes the interaction phase. Thereafter and in response to the exclusive lock being assigned, users other than the first user are prevented from obtaining an exclusive lock to the at least one business object in response to the exclusive lock being assigned. Related apparatus, systems, techniques and articles are also described.