Fix identification of identifier for error report. Setting it to null if the previous attempt was successfull already obviously was a flaw. Using the wrong key HAUPTPROBEN_NR probably could have been avoided by usage of appropriate constants.

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