This function, accessed through Maintenance / Database Maintenance, is very similar to the Orphaned Transactions function. It repairs internal database links where the reservation knows what customer it belongs to, but the customer does not show the reservation in its Reservation History. While this is only a minor problem since it won't affect any reports and will rarely be noticed, it should be corrected.
If there are no orphans found, a simple message will appear saying there are no problems.
If any orphans do exist, each orphaned reservation will be shown in a list with the most relevant details. Since it's most likely that an reservation orphans should be corrected (even if they were subsequently cancelled or checked out), it's recommended to simply click the Fix... button to correct all of the links. If you do want to make adjustments to the reservation first, you can double-click on it to go to Reservation Details.