QBOv3 XML Validation Fault 2500 (Invalid Reference Id ) - ruby-on-rails

Question

I'm trying to create a test invoice at quickbooks using quickbooks-ruby gem. Note I have a test account at QB which doesn't have anything: invoice, customer, etc. It's a new account created only for testing purpose. So here is my code:
service = Quickbooks::Service::Invoice.new
service.company_id = current_user.company_id
service.access_token = create_consumer
qb_invoice = Quickbooks::Model::Invoice.new
qb_invoice.customer_id = 123
line_item = Quickbooks::Model::InvoiceLineItem.new
line_item.amount = 100
line_item.sales_item! do |detail|
detail.unit_price = 100
detail.quantity = 1
detail.item_id = 1
end
qb_invoice.line_items << line_item
res = service.create qb_invoice
p res.id #exception!
def create_consumer
OAuth::AccessToken.new(.....)
end
Request:
METHOD = post
RESOURCE = https://qb.sbfinance.intuit.com/v3/company/fdsfdsfdsfds123/invoice
<?xml version="1.0" encoding="utf-8"?>
<Invoice xmlns="http://schema.intuit.com/finance/v3" sparse="false">
<Line>
<Amount>100.0</Amount>
<DetailType>SalesItemLineDetail</DetailType>
<SalesItemLineDetail>
<ItemRef>1</ItemRef>
<UnitPrice>100.0</UnitPrice>
<RatePercent>0.0</RatePercent>
<Qty>1.0</Qty>
</SalesItemLineDetail>
</Line>
<CustomerRef>123</CustomerRef>
<TotalAmt>0.0</TotalAmt>
<Balance>0.0</Balance>
<Deposit>0.0</Deposit>
</Invoice>
and response with the error:
RESPONSE CODE = 400
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<IntuitResponse xmlns="http://schema.intuit.com/finance/v3" time="2014-03-06T19:30:49.168-08:00">
<Fault type="ValidationFault">
<Error code="2500" element="">
<Message>Invalid Reference Id</Message>
<Detail>Invalid Reference Id : Something you're trying to use has been deleted. Check the fields with accounts, customers, items, vendors or employees.
</Detail>
</Error>
</Fault>
</IntuitResponse>
Could it be because a customer with id = 123 doesn't exist? If not, what's the cause then?

Answer 1

Please check if you have a customer(ID-123) and Item(Id-1) exist in your account.
If not then create these two entries using apiexplorer/code and use the corresponding object IDs.
ApiExplorer - https://developer.intuit.com/apiexplorer?apiname=V3QBO
EntityRef - https://developer.intuit.com/docs/0025_quickbooksapi/0050_data_services/030_entity_services_reference
ApiExplorer -
Ref - https://developer.intuit.com/docs/0025_quickbooksapi/0010_getting_started/0015_firstrequest
Thanks