Hi Juergen....cannot thank you enough for the explanation. You are absolutely correct. When I use anything other than FIFO or FEFO, then the cancellation of open WT's are working. So even though the docs say that it wont work only for FIFO, it does not work for FEFO either.
Well I hope it will be a small enhancement in the BAdi to change this behavior. As you mentioned, making CD along with FEFO will make sense.
Thanks again.
James