Frederic -
You probably already searched Google and have this:
http://books.google.com/books?id=1Ku...201944&f=false
I can say with certainty that there were no Bf 110 units station at Bourges on 5 April, but it is always possible that some Bf 110s might have been passing through. It is even more possible that these were not Bf 110s but rather older model He 111s or Si 204s belonging to FFS B 15. In any event, it does not appear that any of these aircraft were lost or damaged at Bourges on 5 April according to the Gen.Qu.(6.Abt.) loss reports for the schools. Perhaps none were? Perhaps the 354th's claims were just that - claims? Or perhaps these were Si 204Ds built by the Siebel Flugzeugwerke K.G. at Bourges and were never entered into the loss reports because they were the property of the factory and had not yet been delivered to the Luftwaffe? The Si 204D could be mistaken for a Bf 110 because it was twin-engined and had a similar tail configuration.
L.