How to sync tags between posts that are linked through Posts 2 Posts?

Hello Everyone,

I am faced with a thorny problem and can’t seem to find the solution in the wealth of community knowledge on the web. I have two custom posts types “Person” and “Activities”. I use posts 2 posts to link Persons with their various Activities and vice-versa.

I have Taxonomies which apply to Activities. They describe areas of practice and interest. Using them, I’d like to be able to get a list of Persons who partake in Activities tagged with “Cranes”, for example. Where “Cranes” is an Area of interest in my tag-like custom taxonomy.

I suspect the most practical way to go about it would be to apply the taxonomy to both post-types and keep them in sync from the linked Activities to the Persons automatically. Is there a way to do that?

Kind regards,
Evren

http://wordpress.org/plugins/posts-to-posts/