I've been trying every angle I can, but I keep running into Revision ID errors when I try to update a referenced or related entity of another entity. I believe this might be on the right track (http://drupal.org/node/996696)? I'm not sure why these are occurring. I just need a simple field to be updated when the related entity is updated.
It also throws this error: DatabaseTransactionNoActiveException (http://api.drupal.org/api/drupal/includes!database!database.inc/class/DatabaseTransactionNoActiveException/7)
Is there any documentation on how to update one entity when another is updated? I just need to be pointed to the right track on this one.