diff --git a/docs/schema/V1/swagger.verified.json b/docs/schema/V1/swagger.verified.json
index 2529f84a7..a27f1abdf 100644
--- a/docs/schema/V1/swagger.verified.json
+++ b/docs/schema/V1/swagger.verified.json
@@ -1337,6 +1337,11 @@
             "nullable": true,
             "type": "string"
           },
+          "externalReference": {
+            "description": "Arbitrary string with a service-specific reference to an external system or service.\n            \nRefer to the service-specific documentation provided by the service owner for details (if in use).",
+            "nullable": true,
+            "type": "string"
+          },
           "guiAttachmentCount": {
             "description": "The number of attachments in the dialog made available for browser-based frontends.",
             "format": "int32",
@@ -4352,6 +4357,11 @@
             "nullable": true,
             "type": "string"
           },
+          "externalReference": {
+            "description": "Arbitrary string with a service-specific reference to an external system or service.\n            \nRefer to the service-specific documentation provided by the service owner for details (if in use).",
+            "nullable": true,
+            "type": "string"
+          },
           "guiAttachmentCount": {
             "description": "The number of attachments in the dialog made available for browser-based frontends.",
             "format": "int32",
@@ -7445,4 +7455,4 @@
       "url": "https://altinn-dev-api.azure-api.net/dialogporten"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/src/Digdir.Domain.Dialogporten.Application/Features/V1/EndUser/Dialogs/Queries/Search/DialogDtoBase.cs b/src/Digdir.Domain.Dialogporten.Application/Features/V1/EndUser/Dialogs/Queries/Search/DialogDtoBase.cs
index 9303298ec..7d904e170 100644
--- a/src/Digdir.Domain.Dialogporten.Application/Features/V1/EndUser/Dialogs/Queries/Search/DialogDtoBase.cs
+++ b/src/Digdir.Domain.Dialogporten.Application/Features/V1/EndUser/Dialogs/Queries/Search/DialogDtoBase.cs
@@ -71,6 +71,13 @@ public class DialogDtoBase
     /// </summary>
     public string? ExtendedStatus { get; set; }
 
+    /// <summary>
+    /// Arbitrary string with a service-specific reference to an external system or service.
+    ///
+    /// Refer to the service-specific documentation provided by the service owner for details (if in use).
+    /// </summary>
+    public string? ExternalReference { get; set; }
+
     /// <summary>
     /// The date and time when the dialog was created.
     /// </summary>
diff --git a/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Queries/Search/DialogDtoBase.cs b/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Queries/Search/DialogDtoBase.cs
index ac46deaf2..1f28661fc 100644
--- a/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Queries/Search/DialogDtoBase.cs
+++ b/src/Digdir.Domain.Dialogporten.Application/Features/V1/ServiceOwner/Dialogs/Queries/Search/DialogDtoBase.cs
@@ -77,6 +77,13 @@ public class DialogDtoBase
     /// </summary>
     public string? ExtendedStatus { get; set; }
 
+    /// <summary>
+    /// Arbitrary string with a service-specific reference to an external system or service.
+    ///
+    /// Refer to the service-specific documentation provided by the service owner for details (if in use).
+    /// </summary>
+    public string? ExternalReference { get; set; }
+
     /// <summary>
     /// The date and time when the dialog was created.
     /// </summary>