I have created a form that builds an Estimate for Books.   I have a field hidden depending on a previous field selection, the problem is the SKU for the hidden field keeps getting listed along with the SKU of the shown field.   

Can anyone help with a solution to this?  Here is the code for the 2 fields, only one of those fields is shown on the form at any one time....

if(input.Container_Pref6 != "None")
{
 sku = "6MB";
    }
    else
    {
 sku = "6MT";
    }
    getitemsd = zoho.invoice.getRecords("Items",orgid,"Status.All",sku);
    items = getitemsd.get("items").toJSONList();
    for each val in items
{
 if(val.getJSON("sku") == "6MB" || val.getJSON("sku") == "6MT")
 {
  itemdetail = Map();
  itemdetail.put("item_id",val.getJSON("item_id"));
  itemdetail.put("quantity","1");
  itemlist.add(itemdetail);
 }
}
if(input.Container_Pref12 != "None")
{
 sku = "12MB";
    }
    else
    {
 sku = "12MT";
    }
    getitemsd = zoho.invoice.getRecords("Items",orgid,"Status.All",sku);
    items = getitemsd.get("items").toJSONList();
    for each val in items
{
 if(val.getJSON("sku") == "12MB" || val.getJSON("sku") == "12MT")
 {
  itemdetail = Map();
  itemdetail.put("item_id",val.getJSON("item_id"));
  itemdetail.put("quantity","1");
  itemlist.add(itemdetail);
 }
 }