This question is similar to others posed, but all the answers I can find appear to refer to Drupal 6, with CCK fields.
I am using Drupal 7 with the Rules module enabled.
I have created a custom Content Type and one of the fields is an Entity Reference, which allows a registered user to be selected as the Content Type is added. Essentially an administrator can associate a registered website user with the content item being added.
I need to email the referenced user when another field value within the Content Type is changed. I'm sure this is possible via the Rules module, but I cannot get the mail to send.
It must be a fairly common situation, emailing a referenced user when a field value is updated, but I have looked at the online notes for the Rules module and cannot find an example of this particular use case.
Has anybody managed to achieve the same outcome as I am seeking?