If I attempt to add a third AO to a colocation arrangement the "Add" button is unresponsive - i.e., the third AO is not added to the list and no error message is displayed. There should be an error message.
This appears to be a RICE issue. The work around is to add instructional text or add some kind of responsive message that indicates why the button is unresponsive (tool tip on the AO input has been suggested.)
See screen cap from FR1 build of the original error message.