Solved
How to update pxFlow AssignTo property value?
Clipboard structure pyWorkpage > pxFlow > pyFlowParameters(Classless) page: AssignTo property value has to be changed from one operator ID to another Operator ID, how?
Reason: Process is broken due to AsignTo operator id does not exist anymore.
When we open broken process I am getting error message. PFA attached word file that contains clipboard structure and error message which is being thrown by Pega when we open the broken process due to above reason.