Purpose of Tax Classification code in Invoice Workbench ?

Hello,

What is the purpose of Tax classification code in invoice tax lines on invoice workbench

The below tax fields are already available on Invoice tax lines

Tax Regime Eg UK VAT

Tax Eg UK VAT

Tax status - STANDARD TC

Tax rate Name - STANDARD TC

Tax Rate - 20

Tax Jurisdiction - UK-VAT JURISDICTION

Now Tax Classification Code --------   ?????

What is the purpose of Tax Classification code ?

Is Tax Classification Code Mandatory ?

How can Tax Classification Code be used for the benefit of Oracle Payables ?

Regards,

Emma