CDO

Good morning,
I'm using cdo/1.9.6 and the following command in a post-processing script:

cdo --silent --no_warnings -selvar,PT -sellevel,1000/100000 ICMPPSH00006_cut.nc pt_for_ep

The command automatically detects and selects all existing layers between 1000 and 100000 Pa. Unfortunately it also writes one warning line for every layer that doesn't exist; ~99000 lines. Neither --silent nor --no_warnings seem to have an effect on it. Anything else I can do? Is this behaviour wanted?

Cheers, Jan