Hi Jon (or anyone else reading this),Thanks.But just to be specific to the problem I've encountered, see screenshot below.As per the Adobe documentation on this -> https://docs.campaign.adobe.com/doc/AC/en/WKF_Repository_of_activities_Targeting_activities.html#IntersectionExample: Exclude a list of ...

Under targeting activities and exclusions, does anyone know the differences between the three types of Exclusion Types > Change dimensions:1.) Change axis2.) Identifier3.) Joins In what situation would change axis, identifier or joins can be used?Thanks.Paul