N> MOB not to move

[enmity 0]

I made this custom mob that's not supposed to be movable. I edited it to can't be knocked back, but it doesn't seem to work.. What am I missing?

 

3000,Dummy_Tank,Dummy Tank,Dummy Tank,98,2000000,0,0,0,1,0,0,72,37,120,110,60,65,130,52,10,12,1,7,40,2097184,100,76,384,288,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0