Generating Tax Invoice Number for deferred taxes (Thailand)

Hi all,

I'm implementing deferred taxes for Thailand, and am attempting to generate an internal tax invoice number for vendors during the running of the program "Transfer Deferred Taxes".

I've set up the number ranges & intervals, number groups, created a dummy document class, and activated official document numbering for document type SA, which I'm using for the transfer posting.

However, when running the program "Transfer Deferred Taxes", I'm prompted to key in a tax invoice number of my own, which means that the system is not generating the number for me. How can I get this to work?

Thanks,

Daniel