Add Products using Catalog API

Hi,
I am adding products to a Catalog using Catalog API.
I create a Product & a Inventory SKU.  
BUT in site Inventory is not reflected, for all the products I get "Out of

Stock" message. Could this be because of "No Variant" getting created?

How do I remove the "Varient" being mandatory? because for our product we
do 
not have Varients.

The Code is
 Product oProd = baseCatalog.CreateProduct("LPProdDef", sProductID, 
dOriginal_Price, sCategory,....);
oProd["Manufacturer"] = sManufacturer; //custom property
 oProd.Save();
 // Get the product family from the catalog.              
                ProductFamily productFamily = 
(ProductFamily)baseCatalog.GetProduct(sProductID);
                // Add the variant to the product family. 
                productFamily.AddVariant(sProductID);

                //now save the inventory...
                InventorySku oSku = 
oLPInventoryCatalog.CreateSku(sCatalogName, sProductID, dQuantity, 
StockStatus.Enabled);
                oSku.Backorderable = true;
                oSku.StockOutThreshold = 1;                
                oSku.Save();


Regards
Peter