Class for managing item sales price entities.

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

• DeleteEntity
  Deletes an entity.
• GetDataSet
  Retrieves a document by its DocumentID.
• GetEntityByItemRowID
  Retrieves an entity by its EntityID.
• GetEntityByRowID
  Retrieves an entity by its RowID.
• GetList
  Returns a DataSet containing all entities
• GetRowID
  Retrieves an entity by its EntityID.
• 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.