Hi Jaap,
either could be, IF Nowarra is right, although Theodor Beckmann looks the better bet.
I've just looked at
www.ww2.dk/misc/ob1939.htm and for KgzbV 2 there is no Beckmann for commanding officers in September 1939:
Stab. at Kupper-Sagan Oberst Conrad
I Gruppe at
SORAU Hptm von Hornstein.
This isn't really my expertise and is one for the operational/organisational buffs in the group.
Cheers
GrahamB