and I think I figured it out. Is has (again) to do with not aggregating subcodes to a higher (parent) level.
(although I use the updated version of MAXQDA)
For example: 'Werk' has around 40 subcodes, including sub-subcodes and sub-sub-subcodes. If I transform these sub(sub)codes into document variables, an occasional 1 turns up:
It would be a lot of work to turn all 40 sub(sub)codes into document variables, and I would end up with a matrix with many columns, each containing only an occasional number '1'. (since some sub-sub-subcodes occur only once).
While I actually want to know, on parent level, if the (collapsed / aggregated) code 'work' is there or not (binary; Yes or No).
Again: how should I do this?