Get linked item value in configurator event script

I need to get a linked item value in configurator script event. Please advice how this can be done. Version we have is 7.8.2.4

We have sample code below that write to a xml but i need to pull particulare linked item value from the business service bs. Please advice how ?

function Cfg_InstInitialize (RootProduct)
{
var bs = TheApplication().GetService("Remote Complex Object Instance Service");
var inp = TheApplication().NewPropertySet();
var out = TheApplication().NewPropertySet();
var rootid = GetInstanceId();

inp.SetProperty("ClearValues","N");
inp.SetProperty("GetAllValues","Y");
inp.SetProperty("RootProductId","8SIA-7Z3QH");

bs.InvokeMethod("GetLinkItemValues",inp,out);

var bs2 = TheApplication().GetService("EAI XML Write to File");