XPages: I get an http 404 error using a view link, but not if i use a simple action

My xpage app provides 2 ways to open a Project document in a Control xpage. The first way is a combobox selection where I have a button that uses a simple action to open the Control page using the associated docunid of the document. This works. The url looks like this:

…/control.xsp?action=openDocument&documentId=1234

The second way is to simply click the Project entry in a view control, where the column is set to “use entries as links”. This does not work. I get an http 404 error. This url looks like this:

…/control.xsp?documentId=1234&action=openDocument

They look to be basically the same. But, apparently, they are not.

Another thing, the first method works fine until I try to use the second method. The second method fails, and then if I try the first method again, it will fail as well. Maybe its a cache issue, not sure.

Why won’t the view link work? I have other views that work with column links in this same app. This one has me baffled. I must be missing something simple.

Any ideas?