GetChargeDetailRecords Message OperatorId or List<OperatorId>?

[ahzf]

While https://github.com/hubject/oicp/blob/master/OICP-2.3/OICP%202.3%20EMP/02_EMP_Services_and_Operations.asciidoc#eRoamingGetChargeDetailRecordsmessage is talking about a single OperatorId within the request, the swagger file is talking about a list of OperatorIds. Which one is correct? Or do you support both?

{
  "CDRForwarded": false,
  "From": "2021-04-23T02:18:52.478Z",
  "OperatorID": [
    "string"
  ],
  "ProviderID": "string",
  "SessionID": [
    "string"
  ],
  "To": "2021-04-23T02:18:52.478Z"
}