Posts 2 Posts plugin: best way to change connection field value?

So, in my case this way hepled: 1) I’ve replaced 'composer' with 'author' in functions.php (in that part where connections are being registered) and 2) “edited” data in ${wpdb}_p2pmeta using phpmyadmin (UPDATE <yourprefix>_p2pmeta SET meta_value = "author" WHERE meta_value = "composer" or manually or like that).

Please, backup your data, please test in any way etc.