Some sort of “search for meta data” from another post type. In Relationship plugin there is already “Filter by Post Type”, it needs only search for titles in post type (already there) and for meta information in that specific post.
This way we could have replica of address fields (just example, could be useful for other things too). Never mind how we name them and what field type is used, visitor never notice difference. It it most for user editing speed and saving time.
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