code: func (r Billing_Item_Virtual_DedicatedHost) GetParentVirtualGuestBillingItem() (resp datatypes.Billing_Item_Virtual_Guest, err error) {
  	err = r.Session.DoRequest("SoftLayer_Billing_Item_Virtual_DedicatedHost", "getParentVirtualGuestBillingItem", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve A billing item's parent item. If a billing item has no parent item then this value is null.