How can I pass the current date & time to a field when a user does 'Enroute' for an activity?

Summary:

When a user does 'enroute' for an activity, we want a specific field to have the current date & time value.

Content (required):

In chapter 3 of "Administering OFSC" it says to enter 'today' or 'current time' under "Add parameters" but it doesn't work. No value is passed to the field we selected in the Add Parameters screen.

Is there a reference manual on the available functions and proper syntax for "Add Parameters"?

Version (include the version you are using, if applicable):

22A

Code Snippet (add any code snippets that support your topic, if applicable):