Fetch troubles

Let me start by saying, I just started using Zoho Creator today. I cant seem to get Fetch to work on my form. I have created the script below and placed it on the On User in Put. But it will not fetch the Broker name.

if(Inbound_Form [ID == input.Customer_drop].count() > 0)

{

x = Customer_form [ID == input.Customer_drop];

y = Broker_form [ID == x.Broker];

Broker_name = y.Broker_Name;

}

Can some one help me figure this out?

Thanks