Hi Dennis,
Just looking at the program code in the GTS "Plug-In"; the Cancellation Document Type must contain the letters 'N' or 'S' - so the standard 'S1' will work ok, but 'Z53' wouldn't. I wonder if that helps?
I don't think anything much has changed in that area of code between GTS 7.1 and 10.1. I'm fairly sure you don't need any particular configuration settings in GTS. The code there picks up the fact that you're trying to cancel a particular Export Declaration, and takes care of it, so there's no need or point in mapping the Cancellation type to a GTS Document Type.
Bear in mind that it's not possible to cancel an Export Declaration which makes inventory postings - for example, from CWH, IPR or OPR stock, so only those from Free-Circulation can be cancelled.
Regards,
Dave