Elliot Debonee / Profile

I found this script on the forum for limiting open orders but I put it into metaeditor and it givevs me errors when i try to compile it. and would this work with an ea i have on a char like eur usd or usd jpy?   #define MAX_ORDERS 5   

i am using an ea saadscalper, but i want to have it only open one trade at a time. i tried disabling martingale both of them but it did not work. is their a script or something i can do so it only opens one at a time(not more then one)