Multisite problem

[flowdee]

p2p doesn't save connections within (not crossover blogs!) a multisite installation. Worked fine before I upgraded the installation to multisite.

Already tried it in combination with "Proper Network Activation" but the connections are not being saved after adding them. Any suggestions?

add_action('p2p_init', function () {
    p2p_register_connection_type(array(
        'name' => 'bookauthors_to_books',
        'from' => 'bookauthor',
        'to' => 'book',
        'admin_column' => 'any'
    ));
});