is there a way to exclude already connected posts from the selection box?!
I have a Relationship between Products and a Custom Post Type. So a product should only connected to one of the CPT-Post. In the product page, I can select only one CPT-Post. But when I choose products on the CPT-Backend Page I can select multiple products, so it would be great, if already connected products are not visible. I hope you can understand what I mean.