I assume you are actually saying that the item isn't a part yet and you want to get the next ListID value to do the purchase order for the item? Well if that's the case you will need to create the Item first, otherwise if it's an existing item already you just need to find the ListID for for the Item by querying the Item table as shown below.

This is an example of how to add an ItemInventory Item. You can also use the stored procedure "sp_lastinsertid ItemInventory" immediately after the insert statement to retrieve a recordset that has the ListID of the new item you just inserted.

INSERT INTO ItemInventory ("Name", "IsActive", "SalesDesc", "SalesPrice", "IncomeAccountRefListID", "PurchaseDesc", "PurchaseCost", "COGSAccountRefListID", "PrefVendorRefListID", "AssetAccountRefListID", "ReorderPoint", "QuantityOnHand", "TotalValue", "InventoryDate") VALUES ('NewItemInventory', TRUE, 'SalesNew', 0.0013, '1A0000-933270542', 'PurchaseNew', 0.005, '1E0000-933270542', 'A40000-1197774038', '60000-933270541', 25.0, 50.0, 10.0, {d'2005-10-07'})

But before you add any new Inventory Items, you should check the ITEM table first to see if the new Inventory Item Name is not already used in QuickBooks. The ITEM table is a combined list of all Item tables in QuickBooks: ItemInventory, ItemNonInventory, ItemOtherCharge, ItemInventoryAssembly, ItemService, ItemFixedAsset, and ItemGroup; with minimum common fields.

When inserting a new ItemInventory item the Name can't already be, for example, a ItemInventory, ItemNonInventory, ItemOtherCharge, ItemInventoryAssembly, ItemService, ItemFixedAsset, or ItemGroup FullName already. It must be a unquie new ITEM FullName!

To see the item fullnames, you can run the following query in VB Demo:

SELECT ListID, FullName, Description, Type FROM Item

In my case, my Australian QuickBooks 2004 sample file returned the following items:

And like ITEM there's a ENTITY table that's the combined list of all entity tables in QuickBooks: Customers, Employees, Othernames, and Vendors; with minimum common fields.

So when inserting a new Customer name the FullName can't be, for example, a Customer, Employee, Othername, or Vendor already. It must be a unquie new ENTITY FullName in QuickBooks!