diff --git a/services/acl/Acl.Application/IZaakGateway.cs b/services/acl/Acl.Application/IZaakGateway.cs
index 73903f0..1e71337 100644
--- a/services/acl/Acl.Application/IZaakGateway.cs
+++ b/services/acl/Acl.Application/IZaakGateway.cs
@@ -13,6 +13,15 @@ public interface IZaakGateway
     /// </summary>
     Task SetZaakToEindstatusAsync(Uri zaakUrl, Uri zaaktypeUrl, DateOnly datumStatusGezet, CancellationToken ct = default);
 
+    /// <summary>
+    /// Set the given zaak to the <em>cancellation</em> statustype ("Geannuleerd") and record the
+    /// matching cancellation resultaat ("Vervallen") — the ZGW translation of "the 30-day document term
+    /// lapsed" (S-10c). Distinct from <see cref="SetZaakToEindstatusAsync"/> (approval): the gateway
+    /// resolves both the cancellation statustype and resultaattype from the catalogus by their
+    /// omschrijving, POSTs the resultaat then the status, dated <paramref name="datumStatusGezet"/>.
+    /// </summary>
+    Task SetZaakToCancellationStatusAsync(Uri zaakUrl, Uri zaaktypeUrl, DateOnly datumStatusGezet, CancellationToken ct = default);
+
     /// <summary>Read the zaak's <c>identificatie</c> — the public-safe reference the register shows.
     /// The Event Subscriber calls this through the ACL rather than reading ZGW itself (§8.1, #78).</summary>
     Task<string> GetZaakIdentificatieAsync(Uri zaakUrl, CancellationToken ct = default);
diff --git a/services/acl/Acl.Infrastructure/OpenZaakGateway.cs b/services/acl/Acl.Infrastructure/OpenZaakGateway.cs
index 18907ab..2dcffd4 100644
--- a/services/acl/Acl.Infrastructure/OpenZaakGateway.cs
+++ b/services/acl/Acl.Infrastructure/OpenZaakGateway.cs
@@ -62,6 +62,9 @@ public sealed class OpenZaakGateway(HttpClient http, OpenZaakOptions options) :
             "Setting the zaak status", ct);
     }
 
+    public Task SetZaakToCancellationStatusAsync(Uri zaakUrl, Uri zaaktypeUrl, DateOnly datumStatusGezet, CancellationToken ct = default)
+        => throw new NotImplementedException();
+
     public async Task<string> GetZaakIdentificatieAsync(Uri zaakUrl, CancellationToken ct = default)
     {
         ArgumentNullException.ThrowIfNull(zaakUrl);
diff --git a/services/acl/Acl.Tests/AclServiceTests.cs b/services/acl/Acl.Tests/AclServiceTests.cs
index fe2a81a..6d0e79c 100644
--- a/services/acl/Acl.Tests/AclServiceTests.cs
+++ b/services/acl/Acl.Tests/AclServiceTests.cs
@@ -23,6 +23,14 @@ public class AclServiceTests
             return Task.CompletedTask;
         }
 
+        public (Uri Zaak, Uri Zaaktype, DateOnly Datum)? Cancelled;
+
+        public Task SetZaakToCancellationStatusAsync(Uri zaakUrl, Uri zaaktypeUrl, DateOnly datumStatusGezet, CancellationToken ct = default)
+        {
+            Cancelled = (zaakUrl, zaaktypeUrl, datumStatusGezet);
+            return Task.CompletedTask;
+        }
+
         public Uri? ReadReferenceFor;
 
         public Task<string> GetZaakIdentificatieAsync(Uri zaakUrl, CancellationToken ct = default)
diff --git a/services/acl/Acl.Tests/OpenZaakGatewayTests.cs b/services/acl/Acl.Tests/OpenZaakGatewayTests.cs
index e58c050..c570fc0 100644
--- a/services/acl/Acl.Tests/OpenZaakGatewayTests.cs
+++ b/services/acl/Acl.Tests/OpenZaakGatewayTests.cs
@@ -173,7 +173,8 @@ public class OpenZaakGatewayTests
     private sealed class OzRoutes
     {
         public string StatustypenJson { get; init; } = StatustypenPage(withEindstatusFlag: true);
-        public string ResultaattypenJson { get; init; } = """{"results":[{"url":"http://openzaak/catalogi/api/v1/resultaattypen/1"}]}""";
+        public string ResultaattypenJson { get; init; } =
+            """{"results":[{"url":"http://openzaak/catalogi/api/v1/resultaattypen/1","omschrijving":"Geregistreerd"}]}""";
         public HttpStatusCode StatustypenStatus { get; init; } = HttpStatusCode.OK;
         public HttpStatusCode ResultaattypenStatus { get; init; } = HttpStatusCode.OK;
         public HttpStatusCode ResultaatPostStatus { get; init; } = HttpStatusCode.Created;
@@ -251,6 +252,90 @@ public class OpenZaakGatewayTests
         Assert.True(status.Length > 0);
     }
 
+    [Fact]
+    public async Task Approving_selects_the_geregistreerd_resultaat_by_name_when_several_exist()
+    {
+        // Once S-10c adds a second resultaattype (Vervallen), picking the first is ambiguous — the
+        // Zaken API does not guarantee order. Approval must resolve its resultaat by omschrijving.
+        var rec = new Recorder();
+        var twoResultaattypen = """
+            {"results":[
+              {"url":"http://openzaak/catalogi/api/v1/resultaattypen/vervallen","omschrijving":"Vervallen"},
+              {"url":"http://openzaak/catalogi/api/v1/resultaattypen/geregistreerd","omschrijving":"Geregistreerd"}
+            ]}
+            """;
+
+        await Gateway(ApprovalStub(rec, new OzRoutes { ResultaattypenJson = twoResultaattypen }))
+            .SetZaakToEindstatusAsync(new Uri(ZaakUrl), Zaaktype, new DateOnly(2026, 6, 4));
+
+        Assert.Contains("\"resultaattype\":\"http://openzaak/catalogi/api/v1/resultaattypen/geregistreerd\"",
+            rec.Sent("/resultaten").Body);
+    }
+
+    // --- SetZaakToCancellationStatusAsync (document-timeout cancellation / S-10c) ---
+
+    // A catalogus with the three statustypen S-10c seeds (Geannuleerd is non-terminal, below the
+    // Afgehandeld eindstatus) and both resultaattypen. Cancellation must resolve "Geannuleerd" and
+    // "Vervallen" by omschrijving, never the approval pair.
+    private const string CancellationStatustypenJson = """
+        {"results":[
+          {"url":"http://openzaak/catalogi/api/v1/statustypen/ontvangen","volgnummer":1,"omschrijving":"Ontvangen","isEindstatus":false},
+          {"url":"http://openzaak/catalogi/api/v1/statustypen/geannuleerd","volgnummer":2,"omschrijving":"Geannuleerd","isEindstatus":false},
+          {"url":"http://openzaak/catalogi/api/v1/statustypen/afgehandeld","volgnummer":3,"omschrijving":"Afgehandeld","isEindstatus":true}
+        ]}
+        """;
+
+    private const string CancellationResultaattypenJson = """
+        {"results":[
+          {"url":"http://openzaak/catalogi/api/v1/resultaattypen/geregistreerd","omschrijving":"Geregistreerd"},
+          {"url":"http://openzaak/catalogi/api/v1/resultaattypen/vervallen","omschrijving":"Vervallen"}
+        ]}
+        """;
+
+    [Fact]
+    public async Task Cancelling_records_the_vervallen_resultaat_then_the_geannuleerd_status_against_the_zaak()
+    {
+        var rec = new Recorder();
+
+        await Gateway(ApprovalStub(rec, new OzRoutes
+        {
+            StatustypenJson = CancellationStatustypenJson,
+            ResultaattypenJson = CancellationResultaattypenJson,
+        })).SetZaakToCancellationStatusAsync(new Uri(ZaakUrl), Zaaktype, new DateOnly(2026, 6, 4));
+
+        // Resultaat precedes status (OpenZaak requires a resultaat before a closing/terminal status).
+        Assert.True(rec.IndexOf("/resultaten") < rec.IndexOf("/statussen"));
+
+        var resultaat = rec.Sent("/resultaten");
+        Assert.Contains("\"zaak\":\"" + ZaakUrl + "\"", resultaat.Body);
+        // The cancellation resultaat (Vervallen) is chosen by name — not the approval one (Geregistreerd).
+        Assert.Contains("\"resultaattype\":\"http://openzaak/catalogi/api/v1/resultaattypen/vervallen\"", resultaat.Body);
+        Assert.True(resultaat.Length > 0);
+
+        var status = rec.Sent("/statussen");
+        Assert.Contains("\"zaak\":\"" + ZaakUrl + "\"", status.Body);
+        // The Geannuleerd statustype is chosen by name — not the Afgehandeld eindstatus (approval).
+        Assert.Contains("\"statustype\":\"http://openzaak/catalogi/api/v1/statustypen/geannuleerd\"", status.Body);
+        Assert.Contains("\"datumStatusGezet\":\"2026-06-04T00:00:00Z\"", status.Body);
+        Assert.True(status.Length > 0);
+    }
+
+    [Fact]
+    public async Task Cancelling_throws_when_the_zaaktype_has_no_geannuleerd_statustype()
+    {
+        var rec = new Recorder();
+
+        var ex = await Assert.ThrowsAsync<InvalidOperationException>(() =>
+            Gateway(ApprovalStub(rec, new OzRoutes
+            {
+                // Only the approval statustypen — no "Geannuleerd".
+                StatustypenJson = StatustypenPage(withEindstatusFlag: true),
+                ResultaattypenJson = CancellationResultaattypenJson,
+            })).SetZaakToCancellationStatusAsync(new Uri(ZaakUrl), Zaaktype, new DateOnly(2026, 6, 4)));
+
+        Assert.Contains("Geannuleerd", ex.Message);
+    }
+
     [Fact]
     public async Task Approving_falls_back_to_the_highest_volgnummer_when_no_eindstatus_is_flagged()
     {
diff --git a/tests/acceptance/Support/InMemoryZaakGateway.cs b/tests/acceptance/Support/InMemoryZaakGateway.cs
index e9e205d..d16d353 100644
--- a/tests/acceptance/Support/InMemoryZaakGateway.cs
+++ b/tests/acceptance/Support/InMemoryZaakGateway.cs
@@ -12,6 +12,7 @@ public sealed class InMemoryZaakGateway : IZaakGateway
 
     public ZaakRequest? Captured { get; private set; }
     public (Uri Zaak, Uri Zaaktype, DateOnly Datum)? Approved { get; private set; }
+    public (Uri Zaak, Uri Zaaktype, DateOnly Datum)? Cancelled { get; private set; }
 
     public Task<Uri> OpenZaakAsync(ZaakRequest request, CancellationToken ct = default)
     {
@@ -25,6 +26,12 @@ public sealed class InMemoryZaakGateway : IZaakGateway
         return Task.CompletedTask;
     }
 
+    public Task SetZaakToCancellationStatusAsync(Uri zaakUrl, Uri zaaktypeUrl, DateOnly datumStatusGezet, CancellationToken ct = default)
+    {
+        Cancelled = (zaakUrl, zaaktypeUrl, datumStatusGezet);
+        return Task.CompletedTask;
+    }
+
     public Task<string> GetZaakIdentificatieAsync(Uri zaakUrl, CancellationToken ct = default)
         => Task.FromResult("ACC-REF-1");