DDJ - SX - GRID ADJUST

hello Hello!

I got a huge problem, everytime i try (1 a week ~) to remap my DDJ-SX so i can Grid Adjust directly through my device!

But sadly there is just no way, all the time when i am trying to remap something it say's its already used for "MIDI IN / MIDI OUT". 
Well due its not helping at all, i finally make a post in here.

I already have seen in another post that someone said that there is a way, but not how to achieve this. 
Is there a way to beatgrid already? Do I need to remap? How does the Programm let me remap?! Why the hell only 1 Grid Menu per Deck? 

ready? 
GO!

Dreadybear