Final Fantasy Hacktics

Umm... First question about event editing...
I can't seem to do it right.Am I understand something wrong?
Quite confuse about "Walk Unit to a chosen square"
Example I do something as

WalkTo(x21,x00,001,006,x00,x00,+008,x01)

I mean what I understand is target Unit id walk to x=1 y=6 of the map ,right?
Sometime It just not move at all,am I do something wrong?

A.. hello there.
I'm a big fan of fft,I play mod countless time.
I'm just a player but quite interesting in making my own mod.(Normally I would play it myself alone but I may need advice)
Anyway thanks for making this happen,I mean mod. 
Forgive me if I say something harsh, I'm not good as speaker much.