Class for managing item entities.

The following operations are supported. For a formal definition, please review the Service Description.

• DeleteEntity
  Deletes an entity.
• GetBalanceList
  Returns a DataSet with RowID and Balance.
• GetEntityByEntityID
  Retrieves an entity by its EntityID.
• GetEntityByRowID
  Retrieves an entity by its RowID.
• GetFirstEntity
  Retrieves the first entity based on alphabetic order.
• GetLastEntity
  Retrieves the last entity based on alphabetic order.
• GetList
  Returns a DataSet containing all entities
• GetNextEntity
  Retrieves the next entity in alphabetic order by Entity ID.
• GetPriorEntity
  Retrieves the prior entity in alphabetic order by Entity ID.
• GetSchema
  Returns an empty dataset.
• Ping
  Checks connectivity with the server.
• SaveEntity
  Saves an entity. If a valid RowID is provided, an update is performed, otherwise an add is performed.
• UpdateItemQuantityAndCost
  Updates Item quantity and cost values at the Item, ItemSite and ItemSiteLocation level.