code: func (r Billing_Item_Cancellation_Request) ValidateBillingItemForCancellation(billingItemId *int) (resp bool, err error) {
  	params := []interface{}{
  		billingItemId,
  	}
  	err = r.Session.DoRequest("SoftLayer_Billing_Item_Cancellation_Request", "validateBillingItemForCancellation", params, &r.Options, &resp)
  	return
  }
docs: // This method examined if a billing item is eligible for cancellation. It checks if the billing item you provided is already in your existing cancellation request.