I had to turn down a request for a book -- the book did not meet the requestor's many restrictions.  Now it seems the book is no longer on my book shelf.  Must I repost the book?  And then does it go to the back of the line?  Thanks and have a great week everyone! 

If you hit the button that says something like: "This book does not meet the requestor's conditions" then the books should go back on your shelf.  If you just hit "I cannot mail this book" or you accept and then cancel, the book is off your shelf and you have to repost and go to the back of the line. 

Is it a Wishlisted book?  If that's the case, then when you declined the order due to Requestor Conditions, the order would roll to the next person in the Wishlist line - it wouldn't go back onto your bookshelf.