Incorrect error thrown when validating references with only an identifier

[mmsmits]

During testing another issue I encountered the following error:

"severity": "error",
            "code": "invariant",
            "details": {
                "coding": [
                    {
                        "system": "http://hl7.org/fhir/dotnet-api-operation-outcome",
                        "code": "1012"
                    },
                    {
                        "system": "http://fire.ly/dotnet-sdk-operation-outcome-structdef-reference",
                        "code": "DocumentReference(http://nictiz.nl/fhir/StructureDefinition/IHE.MHD.Minimal.DocumentReference).context.encounter->Reference"
                    }
                ],
                "text": "Instance failed constraint ref-1 \"SHALL have a contained resource if a local reference is provided\""
            },
            "location": [
                "DocumentReference.context[0].encounter[0], element DocumentReference(http://nictiz.nl/fhir/StructureDefinition/IHE.MHD.Minimal.DocumentReference).context.encounter->Reference"
            ],
            "expression": [
                "DocumentReference.context[0].encounter[0], element DocumentReference(http://nictiz.nl/fhir/StructureDefinition/IHE.MHD.Minimal.DocumentReference).context.encounter->Reference"
            ]

On the following resource:

{
    "resourceType": "DocumentReference",
        "id": "59d63cbb-8ba7-4b1d-86d1-dd1997232001",
        "text": {
          "status": "extensions",
          "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\"><table><caption>DocumentReference. Subject: De heer H. XXX_Mulders<span style=\"display: block;\">Auteur: Dijklander - Vakgroep Cardiologie (Cardiologie)</span></caption><tbody><tr><th>Type</th><td><span>Specialistenbrief</span></td></tr><tr><th>Geïndexeerd</th><td>2024-02-02T00:00:00+01:00</td></tr></tbody></table></div>"
        },
        "contained": [
          {
            "resourceType": "Organization",
            "id": "author",
            "name": "Dijklander - Vakgroep Cardiologie (Cardiologie)"
          }
        ],
        "masterIdentifier": {
          "system": "urn:oid:2.16.840.1.113883.2.4.3.118.2.71",
          "value": "b26acd82-6ba9-42ce-84dc-89205f65f612"
        },
        "status": "current",
        "type": {
          "text": "Specialistenbrief"
        },
        "class": {
          "coding": [
            {
              "system": "http://loinc.org",
              "code": "52033-8",
              "display": "General correspondence attachment"
            }
          ]
        },
        "subject": {
          "reference": "urn:uuid:c5382b9c-e7f3-4b84-a0e0-53c9cfdec386",
          "display": "De heer H. XXX_Mulders"
        },
        "indexed": "2024-02-02T00:00:00+01:00",
        "author": [
          {
            "reference": "#author",
            "display": "Dijklander - Vakgroep Cardiologie (Cardiologie)"
          }
        ],
        "description": "Cardiologie: Paroxysmale atriumflutter, wv op 22-11-2023 geslaagde cardioversie,\nnadien recidief Atriumflutter met rustige ventrikelrespons, EHRA I,\ncha2ds2vasc2: 2 wv lixiana. Normale QTc na start Sotalol\n\nEr is heden sprake van een succesvolle, electieve, elektrische\ncardioversie.",
        "content": [
          {
            "attachment": {
              "contentType": "application/pdf",
              "url": "/Binary/90000280.R.HL7NL.3.118.2.71.E.b26acd82-6ba9-42ce-84dc-89205f65f612",
              "title": "Specialistenbrief"
            }
          }
        ],
        "context": {
          "encounter": {
            "identifier": {
              "system": "urn:oid:2.16.840.1.113883.2.4.3.118.2.4",
              "value": "0c0eacac-ca20-4f26-ab3b-8cc798cf41e7"
            },
            "display": "Contact: 0c0eacac-ca20-4f26-ab3b-8cc798cf41e7"
          },
          "related": [
            {
              "identifier": {
                "system": "urn:oid:2.16.840.1.113883.2.4.3.118.2.9",
                "value": "242055d4-1668-44e2-95e3-047763286785"
              }
            }
          ]
        }
}

Encounter is of type Reference, but only has an identifier set. The validator sees this as a local reference, and tries to find a contained resource, which is not there, and throws this error.

We should not try to resolve resources with just an identifier.

Note: this resource is in STU3