Database Software

Hi

I've created a master process that has multiple calls to a detail process. The detail process is an authorisation process via a hierarchy of users.
On the first call the detail process completes execution and returns to the master process.
The master process than requires another call to the detail process in order to allow another hierarchy of users to perform the authorisation process.

This is where the issue is-
Firstly, on re-entry to the master process I have tried to purge the detail process from the master process but this does not work. When I call the wf_engine.CreateProcess the error I get is that the instance of the model already exists. This should not have been an issue if the purge process worked.
I then tried to reset the attributes in the detail process and called wf_engine.StartProcess, this opens the detail process and takes the process flow to the appropriate node but the node is not a Notified node.
Is it possible to make the node a notified node?
Is there any way to call a detail process multiple times from a master process, without changing the itemkey?
Thanking you in advance for your help