When you are deleting a reservation is not sync in all languages

Overview of the issue

When using WooCommerce Multilingual with WPML, WooCommerce and WooCommerce Bookings, deleting a reservation does not trigger deleting the corresponding translations.

Workaround

This was fixed in WooCommerce Multilingual 3.7-beta3 available form the WPML.org downloads page.

Also, this patch needs to be applied to WooCommerce Bookings 1.7.13.
https://wpml.org/wp-content/uploads/2015/10/0001-Fix-a-bug-for-WCML-Calendar-synchronization.patch_.zip
The fix will be available in the next WooCommerce Bookings version by default.