A FUNCTION_DEF is a function definition. PROCESS_DEF is a process definition, and ACTIV_USAGE is activity usage of both functions and processes.
Each time an activity is used, it is within a parent (hierarchy). Each model has one root function. The next level activity (function or process) is within the root, and so on.
When an activity is created, a function definition or process definition is created. Each time an activity is used (that is, a usage of it is added in the AHD or ADD), a usage of that activity is created. Therefore, you can retrieve an activity and all its dependent activities. The following table details the ways to retrieve.
ACTIV_USAGE.PARENT_ACTIV_ID = PROCESS_DEF.ID ACTIV_USAGE.CHILD_ACTIV_ID = PROCESS_DEF.ID
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