by COBS Tech Support » Tue Oct 09, 2007 5:45 pm
Pressing F1 the help file and the explanation seems to cover your question:
Select to exclude listing customer invoice sales, invoice adjustments, etc., when the transaction is GST free. It will also exclude listing any GST free items. Any item assigned a zero or blank tax rate is considered by the report to be GST free.
This option may be useful if your business activities are primarily GST free and you only wish to list sales transactions where the tax value was not zero.
This option does not alter the listing of supplier or cash management related transactions. Only transactions that have been allocated tax are listed in the GST inputs section of the report.