Implement negation of query filter closer to underlying API. Previously andNot() negated the whole filter and it's usage in IsUnique was actually a misunderstanding. Having not() as in javax.persistence.criteria.Predicate seems to be more intuitive for negating the whole filter and more flexible.

{
    "land.ortszuordnung": [{
        "id": 1000,
        "probe_id": 1000,
        "ort_id": 23,
        "ortszuordnung_typ": "E",
        "ortszusatztext": "Test",
        "letzte_aenderung": "2012-05-07 09:00:00"
    }]
}