This module comes in handy when you need related pagefields that are dependant on each other. Example: you have a sports team and team members belonging to that team. you need 2 fields: one on the team-page, one on the member-profile. this module keeps both fields in synch. Other examples would be hierarchical company structure or any other kind of membership relation. Demo: settings in this example:   Gitlab: https://gitlab.com/baumrock/PagefieldPairs