Hi. I got a request for a book that I then realized I had posted with the wrong ISBN. So what they are asking for is a version of the book that I don't have. My inclination is to cancel it, but I checked my transaction archive and found I have done so 11 times in the approx. 8-1/2 years I've been on the site. Is that considered a problem pattern? (Perplexingly, 7 of those were cases in which I got a DC number and then cancelled the order, which I have no memory of ever doing)

I would think it would be worse to send a wrong book.  I am not clear on what constitutes a problem swapper for sure.

I've been a member just over 10 years and have had 68 books that were requested of me, but I had to decline for one reason or another after they were requested. Some I found to be unpostable (although I'd checked them before posting), and others don't remember why. I wouldn't worry about it if I were you. Pat

PBS would much rather have you cancel than send the wrong book. The problem would come in if you repeatedly posted and cancelled books. One every six months is not that often. I don't think that PBS will say exactly how many issues make a "problem", but I would think that less than two per year would not be an issue. Cancelling an order is not ideal, but it is hardly a big problem. Even a single RWAP is not going to get you in big trouble. An unresolved RWAP counts as two, but again that will probably not be an issue by itself.

Single RWAPs do not get you in any trouble at all.

There is a cancel button because the site knows that it needs to be used sometimes. There is no penalty for using it as needed.

I concur...cancelling the request because the ISBN doesn't match does not make you a problem swapper...sending the wrong book, or books that don't comply to the guidelines or never marking a request mailed will earn you black marks. I always enter the ISBN shown on my book, rather than reposting from my bookshelf, because I've realized how many people DO send books with the wrong ISBN. I got burned once by just reposting a book that I didn't realize didn't match the ISBN and got RWAPed...learned my lesson the hard way.

"...learned my lesson the hard way."

Me, too! It was a year or so after joining, and mine was an audiobook for dh.  After he had listened to it, I just re-posted from my bookshelf.   The other member didn't rwap me, she just sent me a note saying it was the wrong ISBN. AND, worst of all, was a different narrator!  That info wasn't on our listing, but I hadn't checked out any of that info.  I returned the credits and learned a good lesson!  Good for you, Nora, that you checked it before sending!
 

Always make sure you place the reason in the box. PBS can see the reason.

Basically a secret percentage causes the computer to flag you. Then a human reviews you. Having a reason or real life? Clears you.

(I post books at night, with dim light. Then check for stain issues in the day before sending. No hesitation to cancel on my part, as long as I fill in the reason.)

My personal opinion is that it's very unlikely that PBS ever checks on stuff like that unless they get a complaint from another member. Or there is some report that makes it look like fraud is happening in an account. (I do believe that they are looking for patterns of activity that look like fraud.)

But they have enough to do without making work for themselves.

Nobody at PBS cares or is interested in why a handful of orders get canceled for a member who otherwise mostly sends books successfully.

Thanks to everyone for all the helpful replies, especially since they confirmed my instinct to cancel LOL