Is it possible to see an image of the written FpNr for the entry? It isn't uncommon for medical personnel to put down the wrong unit information - it is fairly common to see such things on Wound Badge citations where the medical admin have put a wrong unit designation just because they are unused to that units order of battle etc.
The first unit for the alternatives I posted (Luftwaffen-Sanitäts-Bereitschaft 2/VI) belonged to Luftgau VI which might have had responsibility for the area including Venlo - see this link with the territory covered. Hopefully someone with better knowledge of the Luftgau organisation will be able to clarify.
http://www.ww2.dk/ground/hq/lgvi.htm