validation "warnings" in the admin?

I can do this easily enough with my own custom object creation view, but I'd like to let my people still use the admin interface. I'd like to be able to do some validation of a created or changed object and issue a WARNING before allowing the user to commit the object to the database. For examp

Database synchronization with sometimes-connected mobile client

Hi everyone. I've developed a django website of medium complexity (about 50,000 lines of python), and the company I work for is now asking for a subset of the functionality to be available on an iPad. I'm familiar with iPad development, so I'm not worried about that, but all the research I've done