I'm working on a Drupal site that includes a view showing unanswered SMS messages. The view shows activities of the Inbound SMS type that have not been revised or deleted, plus a custom PHP filter that restricts it to inbound SMS activities from contacts who don't have an outbound SMS activity with a later date.
The client would to be able to mark off messages that they don't need to answer, and have those no longer show up in the list - basically a way of marking them as read and not in need of a reply. I tried to add a custom field for this to the Inbound SMS activity type - but it doesn't show up as an option! When I choose activities under the "used for" dropdown on the form for creating a custom field, it brings up a second list of specific activity type, but Inbound SMS isn't on it.
Does anyone know if there's any way to get this activity type to show a custom field? Or failing that, any other ideas for how to provide this functionality (a checkbox for marking SMS messages as read, which can then be used as a filter for the view)?