Request:
POST https://quickbooks.api.intuit.com/v3/company/123146307853129/item?requestid=ee2c5cfa-f0b3-d234-29ec-dace9a47d6e9&minorversion=6 HTTP/1.1
Content-Type: application/xml
Authorization: OAuth realm="", oauth_signature_method="HMAC-SHA1", oauth_signature="XFjCpr20QDnbW6%2FUbBB4GHNo7uU%3D",  oauth_nonce="KvI4R", oauth_timestamp="1551907432", oauth_token="lvprdPWPAG2YqjYlQF9xiDtCPG7QSA8qMyvjefVXvLInnKVB", oauth_consumer_key="qyprdZNHZbDxasBSSjQMBj0K3tPijz", oauth_version="1.0"
Content-Length: 1742

<Item xmlns="http://schema.intuit.com/finance/v3">
	<Name>#1 ZIP BOOT -  3/4"- 2 3/4" RF801B</Name>
	<Taxable>1</Taxable>
	<Active>1</Active>
	<UnitPrice>24.95</UnitPrice>
	<Type>Inventory</Type>
	<IncomeAccountRef>97</IncomeAccountRef>
	<ExpenseAccountRef>100</ExpenseAccountRef>
	<AssetAccountRef>99</AssetAccountRef>
	<QtyOnHand>184</QtyOnHand>
	<Description><h3 class="specs_section">Product Specifications</h3>
<ul class="specs-list">
 	<li class="odd"><span class="list-label">Base Width:</span><span class="list-value">6.25"</span></li>
 	<li class="even"><span class="list-label">Fits Pipe Size:</span><span class="list-value">3/4" - 2-3/4"</span></li>
 	<li class="even"><span class="list-label">Material:</span><span class="list-value">EPDM</span></li>
 	<li class="odd"><span class="list-label">Type:</span><span class="list-value">Round Retrofit</span></li>
 	<li>Roofjack square Pipe flashing boots are quality EPDM vent pipe boots designed to provide maximum Ozone, UV light and temperature resistance. Flexible aluminum base will allow the flashing to conform to any metal roof configuration. Pipe location can be centered in the flat of the panel or the rib. Urethane sealant & self-drilling screws complete the installation.</li>
</ul></Description>
	<Sku>SKU-2360</Sku>
	<TrackQtyOnHand>1</TrackQtyOnHand>
	<InvStartDate>2019-02-28</InvStartDate>
</Item>
Response:
HTTP/1.1 100 Continue

HTTP/1.1 400 Bad Request
Server: nginx
Date: Wed, 06 Mar 2019 21:23:53 GMT
Content-Type: application/xml
Content-Length: 427
Connection: keep-alive
Keep-Alive: timeout=5
Strict-Transport-Security: max-age=15552000
intuit_tid: a628f02d-7397-14d6-4f0a-0bc021842b33
Set-Cookie: qboeuid=cc3e666b.583739b4a19a8; path=/; expires=Thu, 05-Mar-20 21:23:53 GMT; domain=.intuit.com
X-XSS-Protection: 1; mode=block

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><IntuitResponse xmlns="http://schema.intuit.com/finance/v3" time="2019-03-06T13:23:53.364-08:00"><Fault type="ValidationFault"><Error code="6240" element=""><Message>Duplicate Name Exists Error</Message><Detail>The name supplied already exists. : Another product or service is already using this name. Please use a different name.</Detail></Error></Fault></IntuitResponse>