[Resolved] Connect field group to parent with php

[Author]

Posts

[Mario]

I have parent cpt 'region' and child cpt 'province'. cpt province as custome field group for the parent 'region'.
Both cpt are importet in DB with wp_insert_post. So far, so good.
Now i want connect each province cpt as a custom field groups to its belonging parent 'region'.

I tried

toolset_connect_posts ('region-province', $region_post->ID, $province_post->ID);

Since i don´t know the name of relationship i guessed 'region-province', 'region' and 'province'. Nothing worked for me.

What i am doing wrong?
I followed all available documentations for apis.

[Mario]

Solution was: toolset_connect_posts ('province', $region_post->ID, $province_post->ID);