Extending ‘post’ type for multisite relations

Hi everybody.

Before all, thank you for the work.

I’m trying to extend the meta-box field type ‘post’ with an addon to create post-to-post relations in a multisite network. For that, I read your tutorial about Create Field Type (https://metabox.io/docs/create-field-type/)

The select html field work perfectly, but on save when site (blog_id) is equals that current blog id, this field is saved correctly, but when blog_id is not’equals to current blog, it does not save the post_meta. Exist any verify data action on save?

I created a GitHub repository whit this add-on here: https://github.com/Flewps/Metabox-Site-Field, if you can help me, I be eternarly grateful.

Thank you for all.
Regards.