code: func (r Virtual_Guest) GetCoreRestrictedOperatingSystemPrice() (resp datatypes.Product_Item_Price, err error) {
  	err = r.Session.DoRequest("SoftLayer_Virtual_Guest", "getCoreRestrictedOperatingSystemPrice", nil, &r.Options, &resp)
  	return
  }
docs: // If the virtual server currently has an operating system that has a core capacity restriction, return the associated core-restricted operating system item price. Some operating systems (e.g., Red Hat Enterprise Linux) may be billed by the number of processor cores, so therefore require that a certain number of cores be present on the server.