http://pages.ebay.com.au/help/policies/listing-multi.html

From Duplicate Listing Policy

"You can't have more than one fixed price listing of an identical item at the same time.

You can have more than one auction-style listing for identical items. However, only one duplicate auction-style listing without bids appears on eBay at a time.

These restrictions on duplicate listings include listing an identical item in different categories or listing an identical item using different user IDs."