Question on Reverse auctions:

Question on Reverse auctions -

Our current auction template setup used bid decrements, and for some reason when auction is in open bidding mode, the auction allows for bids to go from positive amounts to negative amounts. How do I build my auction to NOT accept negative amounts?

ex. Decrement: 50 -

bid entered: 30

The auction will follow the bid decrement rule and enter -20(negtative 20) as a bid. We want the auction to refuse any negative amounts being entered.

Ariba should return an error.

Is there options or setup I should do. Please advise.

Thanks you

Dominic C.