You can NOT transfer cue information from a CDJ-900 to a CDJ-1000 due to the architecture of the CDJ-900.
The way information is stored and read by the players are very different. (the cdj-900 uses much more detail in a way only the new cdjs can understand)
On the other hand CUE data from a CDJ-1000 IS backwards compatible with CDJ-900s/CDJ-2000s
hope this helps ;)