Yes, I created the reciprocal relationship example for that purpose. This also really need to be fields that are not inside a repeater or a flex field as will because there’s really no way to know which row of a repeater should be updated. I suppose, with a bit of work, someone could modify that code to work, but it’s really something that needs to be worked out on a field by field basis.
As I’ve said in other similar topics, I think the main reason that two way relationships are not is ACF is that there are simply too many possible combinations of what can be related and it would be a deep rabbit hole for the developer if he tried to add it. The code is not really that difficult if you confine yourself to a specific set of fields.
