Cannot move to negative position

[ultifay 0]

Just built my Ultimaker, but while doing some primary tests with moving the extruder head in RepG, I notice that the jog values don't work when they go below 0. This means that I cannot move the print bed up above it's position position from when it was turned on. It's not that I cannot move it in one direction, because if I go to 1, I can move back to 0, but not -1. Is this normal behaviour?

[Daid 306]

It's normal behavior with software endstops enabled. Guess the default Ultimaker firmware has this. You need to use the home function first (if that is available in RepG, been a long time that I used RepG)