While this sounds odd, there is a genuine reason! 

In effect, I need to extend the Events module to handle vehicle bookings for various activities.  I am doing this using Form and List modules which I have loosely coupled to Events via hyperlinks.  (This obviously requires some duplicate data entry but retrieval is far more frequent than update!)

I have set up a separate page for each activity, which lists all the vehicles taking part.  Each vehicle has one or more occupants, and may have a trailer.   I have also created a master Form and List module which lists all vehicles booked for all activities.  Each row has a URL which points to the activity page, and includes several columns for occupant Profiles (User profiles - vehicles are also registered Users in this kludge).

The activity page includes a copy of the master Form and List module.  A filter just displays the entries valid for that particular activity. 

Everything works well, but when I try to add a row in the activity page, and in particular when I try to set the URL field pointing to the activity page, the drop down list does not include the current page.  However, when the master is displayed, links to the page are required. 

(A workaround is to edit the row in the master, but I expect to have many thousands of rows here, whereas there will only be tens of rows in each specific activity page, after filtering).

Any ideas?  Thanks, Richard