Oblt Karl-Heinz Schaffer NJG 4

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Hello all

I need HELP to clarify(?) these puzzles

Credited with 5 victories..an ACE..by Luftwaffe Officer Career Summaries

Unknown as ACE in ACES vol.4 (Matthews/Foreman)

4 vict in Luftwaffe Night Fighters Combat Claims (Foreman/Matthews/Parry)

3 vict in Nachtjagd Combat Archives (The Boiten)

3...4? vict in T.Woods list

Among these vict(?)

5-6 May 1944:
6./NJG4 oblt Karl-Heinz Schaffer B-24 (3.)(without mention of place) 00.43 (Foreman/Mathews/Parry

6 May 1944:
Oblt Schaffer 6/JG4 B-24 15km N.Roana (N.Vicenza ) Italy 10.43

J have a french source about this:
5-6 may 1944
6/NJG4 Oblt Karl-Heinz Schaffer B-24 (3.) Mably 5 km ROANNE (FRANCE)

Nothing on this date by Teo Boiten!! ah!

7-8 May 1944
6/NJG4 Oblt Schaffer Stirling LJ-55 off Ushant (island d'ouessant) by T.Wood and Foreman/Mathews/Parry

7-8 May 1944
6/NJG4 Oblt Karl-Heinz Schaffer Stirling (3.) 10 km S.Charolles.....nothing to do with Ushant! source Theo Boiten

HELP
Thanks in advance
Michel