Why is AddItem returning Invalid BIN Price for a Stores Fixed Price listing?

The Item.BuyItNowPrice element is not applicable to Stores Fixed Price listings and will throw an error if submitted in an AddItem request. To specify the cost of a Stores Fixed Price item, use the Item.StartPrice element.

Below is a sample XML API request which lists a GTC (Good Until Cancelled) Stores Fixed Price item for 56.00 US Dollars

<?xml version="1.0" encoding="utf-8"?>
<AddItemRequest xmlns="urn:ebay:apis:eBLBaseComponents">
<Version>967</Version>
<Item>
<ListingType>StoresFixedPrice</ListingType>
<StartPrice currencyID="USD">56.00</StartPrice>
<Country>US</Country>
<Currency>USD</Currency>
<Description>Test Item Description</Description>
<ListingDuration>GTC</ListingDuration>
<Location>San Jose, CA</Location>
<ListingEnhancement>Border</ListingEnhancement>
<PaymentMethods>PaymentSeeDescription</PaymentMethods>
<PrimaryCategory>
<CategoryID>2312</CategoryID>
</PrimaryCategory>
<Quantity>1</Quantity>
<StartPrice>1.0</StartPrice>
<ShippingTermsInDescription>True</ShippingTermsInDescription>
<Title>Test Stores Fixed Price Item</Title>
</Item>
<RequesterCredentials>
<eBayAuthToken>*******</eBayAuthToken>
</RequesterCredentials>
</AddItemRequest>