Hi,

Instead of trying to put a tax code on the invoice tab, try to enter this info by going to Address tab > Delivery tax information.

Also let me know the IFS version that you are working on.

Best regards,

Shehan

IFS9

Thanks for the response. Since I know the IFS version I can share some more information.

You are trying to put in a tax code on the invoice tab. This is incorrect as previously stated. 

If you go to enterprise\company\company > Invoice tab > Tax information tab, there is a field for Tax regime.  If this is VAT, then they are working in a VAT environment and they can enter a tax code on the customers invoice tab. If that is Sales tax, then that means they are working in a sales tax environment. In that case you need to enter tax code info by going to the Customer>Address tab>Delivery tax information tab>Supply country>Taxes.

Hope this clarifies your concerns.

Best regards, Shehan