These settings determine if a tax group is required for each purchase order item, and if so, what actions the system should take if the default tax group is not assigned.
If this option is checked, each purchase order item must be assigned a valid tax group. Also, if this box is checked, either a warning or an error will generate based on the Report No Tax Group as setting.
If theTax Group Required checkbox is checked, these options are enabled. The error or warning messages will occur during the Issue Budgets or Issue Purchase Orders processes.
Error - If this option is selected, an item with a missing tax group is reported as an error, which stops the purchase order process from continuing.
Warning - If this option is selected, an item with a missing tax group will cause a warning message to display. The user will be allowed to choose OK, and have the purchase order process continue. However, the item will not have taxes calculated.
If this setting is checked, taxes and tax groups will no longer be added to the Commitment and Invoice Export files. Taxes will not go to Job Cost on the commitment, but they will still print on the purchase order in WMS Purchasing.
Access the Integration menu > Accounting > Accounting Integration Settings.
Or, select the Accounting Integration Settings 
icon from the toolbar.
Verify the accounting company currently selected in the Accounting Companies grid is the correct accounting company for which this setting will be defined. If necessary, click on a different accounting company.
Click the Tax Settings tab.
Under Tax Group Audit Settings, select whether to require a tax group on all items.
If applicable, select Warning or Error to report an item without a tax group.
Select whether to exclude taxes from going to Accounting or not.
Click on Save.
Continue with configuring the tax group retrieval hierarchy options as necessary, or click the Close 
button to exit the screen.