I would try deleting the sale date and then try entering it again.  If that doesn't work, i would try deleting the purchase date and entering a completely different date just to see if it helps.  If that doesn't work, I would print off the asset entry worksheet and then delete the asset and enter it from scratch.  If that doesn't work, call support and tell them their software is a piece of crap -------------------- you know, sweet talk them a little.