In business modelling for transition triggers, most people
use informal signals that in most cases correspond to
actions of business roles. Also, time and property change
triggers are used to express various states changes
according to time or data based business rules. It is
possible to define inner triggers that happen inside one
state and doesn’t fire a transition. In inventory
management system, register (data store) is checking for
availability of reservation for supplier. If available,
supplier is assigned by a unique id to them and after that
issue the item. Manufacturer notifies the overdue of
product item and after one year the identified item will be
notified as lost or damaged. Example of this concept is
shown in Figure 3.