I am trying to make a wrapper for a com object i have for wireless applications and I found something intereting and at the same time anoying

check this code

#define WLNORMAL  2
#define WLREVERSE 3
X='WLNORMAL+WLREVERSE'

? &X

this code doesn't work. I got the error:
Variable 'WLNORMAL' is not found

it doesn't happend all the time neither. some time the second one is the one not found like
Variable 'WLREVERSE' is not found

my questions:

Why?
is there any work around?
any sugestions to achive this?

thks a lot