OK, I'll do my best to clarify that myself.....
Previously the limit was 255 or 256 but in version 2.5C the limit for PIC18 parts was increased to 1024 entities. The PBP3 manual (which of course is the correct place to look when in doubt) says 1024 for PIC18 parts while the online help in MCSP 5.0.0.3 doesn't mention that, it says 256 for 18C parts though.

/Henrik.