How to access lookup field values in fetch records

I have an application with a product form ICO.
To do a monthly inventory, I created a form Temp_Inv to allow users to enter inventory amounts, in On Load, I fetch records from ICO:
    for each x in ICO
    {
        if (x.Inventory != "Labor")
        {
            insert into Temp_Inv
            [
                Added_User = zoho.loginuser
                MD_Serial = x.MD_Serial
                Inv_Date = eomonth(today,0).addDay(1)
                Supplier = x.Supplier
                Pack_1 = x.Pack_1
                Pack_2 = x.Pack_2
                Manufacturer_No = x.Manufacturer_No
                RLQ = x.RLQ
                Supplier_Product_No = x.Supplier_Product_No
                Picklist = x.Picklist
                Inventory = x.Inventory
                DPI_Class = x.DPI_Class
                DPI_Supp = x.DPI_Supp
            ]
        }
    }

This works fine EXCEPT Supplier is a lookup field and the form has values like 961809000002975135 for the supplier name. I tried to change the line to "Supplier = x.Supplier,ID" but after it was saved it went back to "Supplier = x.Supplier"

How can I access the supplier name?

Thanks
Alex Scott