@Christian_Reich, thanks for pointing this out. We will definetly follow the discussion on the SNOMED extension.
On that note @schuemie in reference to the previous posts regarding the removal of redundant variables (FeatureExtraction: when should redundant variables be removed? (and normalization?)).
Could it in the future be of intereset to have a automated check/warning if two covariates are completely indentical or remove one of the variables? Since on of the two variables are redudant?