With the addition of field calculations, the ability for the calculation to get data from online makes the difference between on and offline even larger.
It'd be really useful to be able to work online with a map, even if offline areas are downloaded. Before an area is downloaded, the offline enabled map is able to be used but not once an offline cache is made.
I expect this is due to versioning, but many other users could have added any amoutn of data after a offline cache has been created, and a user woiuld have less knowledge of that.
