Hi Hans,
Many thanks for the reply, it helps sort things out for me.
Interestingly you mention Oblt Kohla, I also have an individual by that name with Aufkl.Sta. Kaatsch as of 22Aug44.
The info I got on Aufkl.Sta. Kaatsch came from Nick Beale's excellent Ghost Bombers site
http://www.ghostbombers.com/recon/kaatsch1.html
On re-reading the info on Aufkl.Sta. Kaatsch it notes that "Kohla has frequently signed 4.(F)/123" so it would appear there is a definite link between 4.(F)/123 and Aufkl.Sta. Kaatsch.
Have you any further details on Kohla's career?
Best Regards
Andy Fletcher