Quickbooks IPP v3 Invalid Line TaxCode in the request - quickbooks

Question

Using the IPP v3 I am trying to submit an invoice with multiple lines with different taxcode(s), I am getting the following error when submitting an invoice with 2 lines with TaxCodeRef mapping to existing TaxCode(s).
<IntuitResponse xmlns="http://schema.intuit.com/finance/v3" time="2015-06-11T00:32:48.687-07:00">
<Fault type="ValidationFault">
<Error code="6100" element="Line.SalesItemLineDetail.TaxCodeRef">
<Message>Invalid Line TaxCode in the request</Message>
<Detail>Valid line TaxCodes for US should be TAX or NON. Supplied value: 8</Detail>
</Error>
<Error code="6100" element="Line.SalesItemLineDetail.TaxCodeRef">
<Message>Invalid Line TaxCode in the request</Message>
<Detail>Valid line TaxCodes for US should be TAX or NON. Supplied value: 9</Detail>
</Error>
</Fault>
</IntuitResponse>
Here is the submitted XML, TaxCode with Id 8 and 9 are defined and active.
<?xml version="1.0" encoding="UTF-8"?>
<ns0:Invoice xmlns:ns0="http://schema.intuit.com/finance/v3">
<ns0:TxnDate>2015-06-11</ns0:TxnDate>
<ns0:Line>
<ns0:LineNum>1</ns0:LineNum>
<ns0:Description>Product1</ns0:Description>
<ns0:Amount>54.95</ns0:Amount>
<ns0:DetailType>SalesItemLineDetail</ns0:DetailType>
<ns0:SalesItemLineDetail>
<ns0:ItemRef>20</ns0:ItemRef>
<ns0:UnitPrice>54.95</ns0:UnitPrice>
<ns0:Qty>1</ns0:Qty>
<ns0:TaxCodeRef>8</ns0:TaxCodeRef>
</ns0:SalesItemLineDetail>
</ns0:Line>
<ns0:Line>
<ns0:LineNum>1</ns0:LineNum>
<ns0:Description>Product2</ns0:Description>
<ns0:Amount>54.95</ns0:Amount>
<ns0:DetailType>SalesItemLineDetail</ns0:DetailType>
<ns0:SalesItemLineDetail>
<ns0:ItemRef>20</ns0:ItemRef>
<ns0:UnitPrice>54.95</ns0:UnitPrice>
<ns0:Qty>1</ns0:Qty>
<ns0:TaxCodeRef>9</ns0:TaxCodeRef>
</ns0:SalesItemLineDetail>
</ns0:Line>
<ns0:CustomerRef>58</ns0:CustomerRef>
</ns0:Invoice>
Is it possible to submit one invoice with multiple lines having different TaxCodes for Quickbooks online ?

Answer 1

I think you're asking the wrong question. You're asking:
Is it possible to submit one invoice with multiple lines having different TaxCodes for Quickbooks online ?
But the error is telling you:
Valid line TaxCodes for US should be TAX or NON. Supplied value: 9
So the problem isn't that you're submitting different tax codes. The problem is that you're submitting an invalid tax code.
You submitted:
<ns0:TaxCodeRef>9</ns0:TaxCodeRef>
When the only valid submissions are:
TAX or NON
e.g.
<ns0:TaxCodeRef>TAX</ns0:TaxCodeRef>
or
<ns0:TaxCodeRef>NON</ns0:TaxCodeRef>
There are no other valid values for QuickBooks Online in the USA. Only TAX and NON.
For QuickBooks Online outside of the USA this behavior differs a little in that other countries support a different set of tax does (e.g. GST, HST, PST, etc.)

Answer 2

For US Quickbooks organisation/company, tax rates is handled differently. You need to create or add separate logic for US Locale:
See below from quickbooks US documentations:
https://developer.intuit.com/app/developer/qbo/docs/develop/tutorials/manage-sales-tax-for-us-locales
And this is the non US documentation which was your code followed:
https://developer.intuit.com/app/developer/qbo/docs/develop/tutorials/manage-sales-tax-for-non-us-locales#specifying-sales-tax