Import data from two sources into one company in quickbooks - quickbooks

Question

I have two web portals (different domains) but i want to import clients, vendors and invoices from both web portals to my quickbooks using webconnector. What i have tried is creating two qwc files and and configured in the webconnector but whenever i try to import invoice from second company i am getting error of invalid reference.... not found (but the name of client matches exactly like i have on quickbooks with the xml i am creating to run import for invoices ). Below is the error i get when i run import
3140: There is an invalid reference to QuickBooks Term "Client, Test" in the Invoice. QuickBooks error message: Invalid argument. The specified record does not exist in the list.
Below is the xml i use to import invoice
<?xml version="1.0" encoding="utf-8"?>
<?qbxml version="13.0"?>
<QBXML>
<QBXMLMsgsRq onError="continueOnError">
<InvoiceAddRq requestID="39">
<InvoiceAdd>
<CustomerRef>
<FullName>Client, Test</FullName>
</CustomerRef>
<TxnDate>0000-00-00</TxnDate>
<RefNumber>Zaztest</RefNumber>
<ShipAddress>
<Addr1>6050 Hellyer Ave #100C</Addr1>
<Addr2></Addr2>
<City>San Jose</City>
<State>California</State>
<PostalCode>95136</PostalCode>
<Country></Country>
</ShipAddress>
<PONumber>Client</PONumber>
<TermsRef>
<FullName>Client, Test</FullName>
</TermsRef>
<DueDate>0000-00-00</DueDate>
<InvoiceLineAdd>
<ItemRef>
<FullName>Bill:ZigSig Fee</FullName>
</ItemRef>
<Rate>141</Rate>
</InvoiceLineAdd>
</InvoiceAdd>
</InvoiceAddRq>
</QBXMLMsgsRq>
</QBXML>

Answer 1

You say that the client (customer) exists...
" not found (but the name of client matches exactly like i have on quickbooks with the xml"
However, that's not what the error message is telling you. The error message has nothing to do with the customer name. It's about the terms name. The error:
invalid reference to QuickBooks ****Term**** "Client, Test"
(Emphasis on Term mine). The error message isn't about how the customer is named, it's about how the terms are named.
Terms are usually something like Net 30 or Due on Receipt. They should not be the same as the customer name.
TLDR: Fix your qbXML to send a valid TermRef/FullName value:
<TermsRef>
<FullName>Client, Test</FullName>
</TermsRef>