Users cannot command a single distance move that crosses 2^31 (2,147,483,648) the rollover point.
Two potential work arounds:
You can command a JOG FWD or JOG REV (continuous moves) across that threshold and then monitor the position register.
Or, you can however get around this with commanding it as 2 different moves without stopping.
So if you wanted to do 1000 incremental move and the PPU was large (such as a motor with high resolution absolute encoder and/or with high gear ratio):
STP 0
Y/500
STP 10
Y/500