Example: We have an Acknowledgement process for an Incident once the Incident gets assigned to a Support Group. A technician from that Support Group will click the Acknowledge action inside the Incident and will get an Acknowledgement Window where they select their name from the list and save/close the window. If the Incident needs to be Assigned to another Support Group, the Acknowledgement process starts over. During subsequent Acknowledgements the Acknowledgment window will open up and contain the previous Acknowledged name be default.
I can set the value to a Null value via an Automatic action in the Incident Process, but would like to find a way to do this via a calculation on the attribute.