Wrong tax code in the customer line item.

HI All,

We are facing an issue with the tax code in the customer line item.

As you can see in the attachment the document shows tax code CA where as when we click on the 1^st line item (customer) and click on Tax data we get WB as the tax code. Why different tax code is displayed in tax data and the document.

Can anyone please tell me how this tax code is picked.

Thank you

Kevin