CDJ beat jump loop mode question

Hi,

I love the idea of being able to loop up a few bars, then move that loop around - i see it can be done now by looping up a section, then hitting beat jump on the screen -  but it only allows you to do it by 1/2 bar or 1bar maximum - the 8 and 16 beat jump buttons are greyed out.

Why is this? 

Am i missing something here? Surely we can move the loop around up to 32 beats if we wish?

Thanks