How do i set up PAYG withholding for a supplier with no ABN in Reckon?

I have a supplier with no ABN and have to withhold 49% tax from his payment. I have set up a tax code ABN and corresponding tax item at 49% but when I try to enter a bill using the new tax item, the tax is not calculated at 49% but at around 32%. This happens whatever i tick on the includes tax box at the bottom of the bill.

Also the options on the  tax line in the tax item don't give me 'PAYG withholding No ABN quoted' as a choice, only GST, GST free, Input taxed or sales tax. This is none of those.'

Please can someone advise me as to how I set my system up to cope with payg withholding no abn quoted as I have a number of these.

I am using the latest full desktop multi user version of Reckon. I just migrated a few weeks ago from MYOB

Cheers

Anne