<?php 
// add this to your theme's functions.php or ask your developer to append the following lines
add_filter( 'smart_seo_export_fields', 'demo_export_other_custom_fields', 8, 1 );
function demo_export_other_custom_fields( $fields ){
	
	// See if this is a WPML site and add columns "language_code", "parent_title" to CSV
	if( class_exists( 'SitePress' ) ){ 
		$fields[] = array( 'language_code', 'callback_language_code' ); 
		$fields[] = array( 'parent_title', 'callback_parent_lang' );
	}

	return $fields;
}

function callback_language_code( $post ){
	$post_language_details = apply_filters( 'wpml_post_language_details', NULL, $post->ID ) ;
	return $post_language_details['language_code'];
}

function callback_parent_lang( $post ){
	return get_the_title( apply_filters( 'wpml_object_id', $post->ID, $post->post_type ) );
}
?>