The creation of a dossier takes place via the same call as the creation / upload of a document.
However, the parameters 'filename', 'contentUri' and 'ContentlocationUri' are omitted here.
A corresponding mapping to the corresponding d.3One dossier is of course required.
The dossier is created in one step.
Example:
POST   https://<BaseUri>/dms/r/<repoId>/o2m
  contenttype = application/json

  Origin = <BaseUri>
  Accept = application/hal+json
  body  = 
           {
          "sourceCategory": "Auftragsakte",
          "sourceId": "/myapp/source",
          "sourceProperties": {
          "properties": [{
           "key": "ABnr",
           "values": ["0912201901"]
         },
        {
        "key": "KdNr",
        "values": ["91201"]
        },
       {
       "key": "Name",
         "values": ["Kunde1"]
     }
  ]
 }
}


Response=

....
Location = /dms/r/<repoId>/o2m/<Docid>?sourceid=%2fdms%2fr%2f<repoid>%2fsource

....