Guys

The documentation is very lacking on reports... I have created a sample report just to test the water, but it doesnt seem to be showing up in the admin system. I have also tried

SS_Report::register("ReportAdmin", "BookingReport_BookingSummary");

but get a error that SS_Report is undefined?

<?php
/** 
 * This report lists all the pages in the CMS
 * of type Page. Sorted by title.
 */
class BookingReport_BookingSummary extends SideReport {
    public function title() {
        // this is the title of the report
        return "Booking Summary Report";
    }
     
    // public function records() {
    //     // the data the report returns all the dataobjects of type Page and sorted by title. See datamodel for more info
    //     return Bookings::get()->sort("Created ASC");
    // }

    function records($params, $sort, $limit){  
        if(isset($params['Colour'])){
            $Bookings = DataObject::get("Bookings", "BookingStatusID = '" . $params['BookingStatusID'] ."'", "Created DESC", Null, $params['ResultsLimit']);         
            return $Bookings;
        }
    }
     
    public function fieldsToShow() {
        // fields you want to display. This will display a list of titles which link to the page in the cms. Handy!
        return array(
            'Name',
            'NumberOfAdultPassengers',
            'NumberOfChildPassengers',
            'NumberOfInfantPassengers',
            "FlightNumber",
            "DepartureAirport",
            "FlightArrivalDate",
            "FlightArrivalHour",
            "FlightArrivalMin",
            "FlightDepartureDate",
            "FlightDepartureHour",
            "FlightDepartureMin",
            "HotelName",
            "HotelAddress",
            "Town",
            "OutboundFlightNumber",
            "InboundFlightNumber",
            "InboundDepartureAirport",
            'Reference',
            "Total",
            "BookingPIN"                

        );
    }  


    function parameterFields() {
        $params = new FieldSet();
        //Colour filter
        $params->push(new DropdownField(
            "BookingStatusID", 
            "Booking Status", 
            array(
                '1' => 'Not Paid',
                '2' => 'Cancelled',
                '3'=> 'Paid',
                'NULL' => 'All'
              )
        ));
 
        //Result Limit
        $ResultLimitOptions = array(
            50 => '50 Bookings',
            100 => '100 Bookings',
            200 => '200 Bookings',
            500 => '500 Bookings',
            Null => 'All Bookings'
        );
         
        $params->push(new DropdownField(
            "ResultsLimit", 
            "Limit results to", 
            $ResultLimitOptions,
            50
        ));
                 
        return $params;
    }   

}
?>

You don't need to register reports in SS3, they are registered automatically. Comment out the following:

SS_Report::register("ReportAdmin", "BookingReport_BookingSummary");

Also, you need to do a dev build for it to show.