My thanks to Gregory Van de Wiele who raised some questions over my statements about call-back patterns in my recent article on Direct Binding.   In attempting to dispel some myths, I was indeed adding my own!!   I had failed to understand the implications of the differences between Call Orchestration and Send Orchestration shapes, and the additional ways in which self-correlating ports can be used specifically with Start Orchestration shapes.   I have issued an amended and corrected version of the article.