Previously for Translator to work correctly with Retail Express we needed to turn off the taxes setting in WooCommerce. The tax invoice is generated by Retail Express was different from Woo's  calculation it so we need it turned off. This is set under the General Tab in Woocommerce / Settings.

This example below the setting is on and needed to be turned OFF (Not ticked)

This is no longer the case and we now support WooCommerce Taxes. Please not they need to be set up correctly with the tax amount INCLUDED in the amounts