Hello Peter
This would likely have been reported up the chain. Look in the Unit War Diary Appendices for Operational Instructions etc., with a Distribution List and take a note of other Units / Chain of Command and look up the War Diaries in the List. But no guarantee of finding anything further.
Try separate searches of 'friendly', 'own', 'identification', 'recognition', 'fire', 'firing', 'allied', etc., with year, in 'WO' and 'AIR' etc. Some General or Policy files on the subjects just mentioned, might have odd references to incidents.
A search has been on/off for 15 years for more information, about the friendly fire incident mentioned here, if you log in you can see document image:-
http://forum.12oclockhigh.net/showthread.php?t=29746
'AIR' reference, search 'friendly' for '1944' gives 27 records and this gives (no guarantee of whether incident is here, or elsewhere):- AIR 37/650
http://discovery.nationalarchives.go...d=1944&_ro=any
Mark