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  • I did it with this code!

    /*save custom post field*/
    function my_acf_save_post( $post_id ) {
    		// An array of IDs of categories we want this post to have.
    		$cat_ids = get_field('localita-popolata');
    		//If this was coming from the database or another source, we would need to make sure
    		//these were integers:
    		$cat_ids = array_map( 'intval', $cat_ids );
    		$cat_ids = array_unique( $cat_ids );
    		wp_set_object_terms( $post_id, $cat_ids, 'struttura_category' );
    add_action('acf/save_post', 'my_acf_save_post', 20);