Job

I have found the solution by myself.

This is the code u can use to make invoice number as a single Woocommerce admin order list.

Set this code in functions.php of your WP theme

function woo_order_extra_columns($columns)
{

  $newcolumns = array(
		"cb"       		=> "<input type  = \"checkbox\" />",
		"invoice_number"    => esc_html__('Factuurnummer', 'woocommerce'),
	);

	$columns = array_merge($newcolumns, $columns);

	return $columns;
}
add_filter("manage_edit-shop_order_columns", "woo_order_extra_columns");

function woo_order_extra_columns_content($column)
{
	global $post;

	$invoice_number = wcdn_get_order_invoice_number($post->ID);

	switch ($column)
	{
		case "invoice_number":
			echo $invoice_number;
		break;	

	}
}
add_action("manage_posts_custom_column",  "woo_order_extra_columns_content");

Ow, I didn’t know that, i am sorry.

It’s actually quite logical 😉