I think you've been given some good pointers in the right direction, I'll just add that you need to read and understand the eventual consistency, transactional and cross entity group (XG) transaction docs for the datastore.
My guess is based on your question you haven't wrapped your head around it, and as a result your data models and subsequently data are going to get broken. Fixing them after go live will be hard, so you need to get a lot closer now. Once you've got the basic concepts down, it should become clearer how to model this, and why this is happening. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/61e6a8a7-3aaa-4cc2-b077-3c58632a271f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
