I can't seem to figure out how to post both copies of this book.  Anyone out there that can help?

If they have the same isbn, then no, you can't.  You'll have to wait until one gets requested and then you can post the other.

I lucked out once and bought 11 copies of a WL'ed book at a FOL sale.  I just kept feeding them into the system as I mailed them (I think once you mail them, you can post the next one).  The final copy went in a swap.  Good luck!

as Amy and Laura said, if it is the same ISBN then you can't post them both at the same time and the first book must be marked mailed before you can post the 2nd copy.  I'm sure that it is to make sure you really do have 2 copies.

what I did when that happened was to accept the order and then mark it mailed and then posted the 2nd book hoping it would be accepted quickly and I could make one trip to the PO.  If the 2nd book hadn't been accepted quickly (before the end of the day when I shut my computer off) I would have mailed the first one anyway and then just gone back to the PO a 2nd time.  I do not like to mark books mailed until they are actually at the PO.

I don't think the system lets you post more than one at a time(unless they have different isbn numbers).

Yes, they would beoth have to have different ISBN's. I have two copies of a book on my bookshelve, but one is hardback and one is paperback..

That stinks because both books I have that are duplicates have a ton of copies in the system already.  Oh well, I'm offering them up as freebies with an order on my profile page.  Hopefully they will get snatched up that way!

You can post one of them, and as soon as it is requested and you mark that it is mailed, you can then post the other one (this has happened to me a couple of times).