It should be OK. I'm curious where/how you found this spec.
Here is what I'm trying to do to find it and the problem I have:
I tried finding it using your car as an example, so i selected a '88 300CE, then selected the "confirm" button on the following screen. Selected "engine manual", then selected "mechanical and combustion manual" (the other 2 choices were LH injection and cruise control). The screen I get next only offers these choices:
07.3 KE injection
09 air cleaner
14 intake and exhaust manifolds and emission control
30 accelerator control
47 fuel system
49 exhaust system
I tried doing this with several different 103 engine-equipped vehicles with the same results. No selection for group 01 like there should be.