A Sub-Process (Nested Business Process) is an independent business process initiated during the execution of the parent process. When a sub-process is initiated, ELMA suspends the execution of the parent process until the sub-process is completed. The only exception is the external sub-process with the "Multiple Execution" marker.
Sub-processes are used in business process modeling for decomposition. This approach allows you to break down one large task into a series of smaller tasks. Decomposition is needed when a process model turns out too complex and hard to read, or if there is a sequence of actions in the process that can later be used in other business processes.
Internal Sub-Process is a business process executed in the context of the parent process. It belongs to the parent process and therefore uses the data stored in the parent process. Though an internal sub-process is executed within the parent process, it can have its own context variables that exist only within the sub-process. You can start the internal sub-process only within its parent process.
Fig. 1. Internal sub-process in the graphic model.
Fig. 2. External sub-process in the graphic model.
