DDJ-RX Jog wheel & beginning of track question!

Hi all,
How do I stop Rekordbox DJ + the DDJ-RX from having the jog wheel being able to spin behind the starting point of my tracks loaded? For example, on CDJ2000's when I load a track and turn the jog to the left, the position of the 'cursor' if you want to call it that will not go past the starting point of the track/sample regardless of how far you turn the jog wheel.... Whereas on my ddj-rx + rekordbox dj, if i spin the jog left the playing position goes in to the negative time bracket, which I dont desire....

I hope someone understands what I mean here and is able to shed some light on this....

Thanks in advance...