Tax report

[John Zoetebier]

GnuCash version 1.8.0
I have setup a new company account.
There is a sales tax of 12.5%
I entered an invoice with several items and posted the invoice.
Sales tax is correctly posted to GST account.
Next I entered a receive payment to cash account.
When I print a tax report it show tax is 0.
Can anybody tell me what I have to do to show tax on the tax report ?

-- 
John Zoetebier
Web site: http://www.transparent.co.nz