Word 2013 templates not compatible with Office Accounting 2009

I’ve just discovered that our custom Invoice templates that we had defined in Office 2007 / 2010 no longer work in Word 2013, when we try to export an Invoice the XML is left in tact. Editing the template yields:

This is fully documented by Microsoft at http://support.microsoft.com/kb/2761189 and basically says it’s the US government’s fault!

I guess we’ll go back to Word 2010, at least it’s not all grey…