I used Relation Post Types plugin to define post to a custom post type called agency, which means that some posts belong to some agency.
I also have a page template to display the custom post type agency.
I want to have a widget to show posts related to this custom post type.
I tried most of the widgets such as Recent Posts Widget Extended or Special Recent Posts FREE Edition but the problem is that the widget cannot filter posts based on above relationship.
Any suggestion to achieve above?