When editing a multiple item / Dutch Auction listing the error generated if the Qty field entry is out of bounds is incorrect:

Quantity: Dutch Auctions must have a quantity of 2 or more items and less than 25. In addition, these items must be identical.
The limit was recently raised to 100 items per listing.

P.S. You can still only enter a maximum of 99 when creating a listing as there are only 2 digits allowed in the Qty field. The edit form goes the other way and allows the entry of silly numbers (e.g. 9999999).