samplingEffort requires looking at the previous record, not the current one

[PietrH]

For effort

The record always reflects the current situation, but if you want to know what has changed, you need to look at the previous record(s). So it doesn't show the history, it does show the current situation.

So if you want to know what traps were out when the animal was caught, you need to look at what material was out in the previous record.

If there is a catch in the first record, assume no material was used. (Or material was unknown)

[PietrH]

Sampling effort and sampling protocol are both based on Materiaal_Vast, and no other fields.