Tell us what you are trying to do?
How can I resolve this issue with post relationship in picture in attachment?
My default language is English set by WPML.
Can you please share the exact problem URL where you see the message you shared?
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.
First of all - I see you created two many-to-may relationship using same post types. May I know you want two many-to-many relationships for the same post types? If no - can you please delete the unwanted post relationship:
=> hidden link