The stored procedure 'dbo.ctlg_CheckAndUpdateTimestamp' doesnt ex

Hi

I am trying to change the list price for a product then update the
back-end 
catalog. 
My code is as follows:
ProductCatalog catalog;
Product prd;
   catalog =
CommerceContext.Current.CatalogSystem.GetCatalog(sBaseCatalog);
   prd = catalog.GetProduct(sProductID);
   prd.ListPrice = 0.99M;
   prd.Save();

When I execute prd.Save i get an exception 
The stored procedure 'dbo.ctlg_CheckAndUpdateTimestamp'  doesnt exist

Can someone help?


Thanks