WordPress at a glance
action is not described

woocommerce_admin_order_data_after_order_details action-hook . WC 1.0

Usage

add_action( 'woocommerce_admin_order_data_after_order_details', 'action_function_name_5076' );
function action_function_name_5076( $order ){
	// action...
}
$order
-

Where the hook is called

WC_Meta_Box_Order_Data::output()
woocommerce_admin_order_data_after_order_details
woocommerce/includes/admin/meta-boxes/class-wc-meta-box-order-data.php 310
<?php do_action( 'woocommerce_admin_order_data_after_order_details', $order ); ?>

Where in WP core the hook is used WooCommerce

woocommerce/includes/tracks/events/class-wc-order-tracking.php 19
add_action( 'woocommerce_admin_order_data_after_order_details', array( $this, 'track_order_viewed' ) );