hi,
you can add a gateway before PM, then connect an event to the gateway.
in DM, you can signal an event to make the process reach PM again, and them complete PM.
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-778729-19940/450-265/sample-image.png
Or you can use a decision gateway after DM, if DM makes a disagree decision, then the process goes back to PM.
Ted