diff --git a/infra/run-domain-check.sh b/infra/run-domain-check.sh
index a701b21..74d6122 100755
--- a/infra/run-domain-check.sh
+++ b/infra/run-domain-check.sh
@@ -79,9 +79,9 @@ fl="$(docker ps -q --filter 'name=flowable-rest' | head -1)"
 fl_base="http://$(ip "$fl"):8080/flowable-rest/service"
 reg_id="${loc##*/}"
 
-# Extracts the Beoordelen task id for our registration from a Flowable task-query response on stdin.
-# Tolerates an empty/non-JSON body (a transient failure during the poll) by printing nothing.
-task_for_reg() { REG_ID="$reg_id" python3 -c "import os,sys,json
+# Extracts the Beoordelen task id for a given registration from a Flowable task-query response on
+# stdin. Tolerates an empty/non-JSON body (a transient failure during the poll) by printing nothing.
+task_for_reg() { REG_ID="$1" python3 -c "import os,sys,json
 try:
     d=json.load(sys.stdin)
 except Exception:
@@ -98,7 +98,7 @@ echo ">> polling Flowable for the Beoordelen user task (werkbak)"
 task_id=""
 for _ in $(seq 1 30); do
   resp="$(flcurl -X POST "$fl_base/query/tasks" -H 'Content-Type: application/json' -d "$query" 2>/dev/null || true)"
-  task_id="$(printf '%s' "$resp" | task_for_reg)"
+  task_id="$(printf '%s' "$resp" | task_for_reg "$reg_id")"
   [ -n "$task_id" ] && break
   sleep 2
 done
@@ -115,7 +115,44 @@ flcurl -X POST "$fl_base/runtime/tasks/$task_id" -H 'Content-Type: application/j
 
 echo ">> asserting the process finished (no Beoordelen task remains for the registration)"
 resp="$(flcurl -X POST "$fl_base/query/tasks" -H 'Content-Type: application/json' -d "$query")"
-still="$(printf '%s' "$resp" | task_for_reg)"
+still="$(printf '%s' "$resp" | task_for_reg "$reg_id")"
 [ -z "$still" ] || { echo "FAIL — Beoordelen task $still still active after completion" >&2; exit 1; }
 echo "OK — behandelaar claimed and completed the Beoordelen task; the registratie process finished"
+
+# ── S-11: withdrawal. A second registration parks at Beoordelen; the citizen withdraws it via the
+# domain, which delivers the RegistratieIngetrokken message to the task's execution, tripping the
+# BPMN boundary event so the process ends and the Beoordelen task disappears (ADR-0014). ────────────
+echo ">> submitting a second registration to withdraw"
+loc2="$(docker run --rm --network "$net" curlimages/curl:latest \
+  -fsS -D - -o /dev/null -X POST "http://$dom_ip:8080/registrations" \
+  -H 'Content-Type: application/json' -d '{"bsn":"123456782"}' \
+  | sed -n 's/\r$//; s/^[Ll]ocation: //p' | head -1)"
+[ -n "$loc2" ] || { echo "FAIL — second POST /registrations returned no Location" >&2; exit 1; }
+reg_id2="${loc2##*/}"
+echo ">> second registration $reg_id2"
+
+echo ">> polling Flowable for its Beoordelen task"
+task_id2=""
+for _ in $(seq 1 30); do
+  resp="$(flcurl -X POST "$fl_base/query/tasks" -H 'Content-Type: application/json' -d "$query" 2>/dev/null || true)"
+  task_id2="$(printf '%s' "$resp" | task_for_reg "$reg_id2")"
+  [ -n "$task_id2" ] && break
+  sleep 2
+done
+[ -n "$task_id2" ] || { echo "FAIL — no Beoordelen task appeared for registration $reg_id2" >&2; docker logs "$dom" 2>&1 | tail -15 >&2; exit 1; }
+echo ">> Beoordelen task $task_id2 is waiting; withdrawing the registration via the domain"
+
+docker run --rm --network "$net" curlimages/curl:latest \
+  -fsS -X POST "http://$dom_ip:8080/registrations/$reg_id2/withdraw" >/dev/null
+
+echo ">> asserting the process was cancelled (no Beoordelen task remains for the registration)"
+gone=""
+for _ in $(seq 1 15); do
+  resp="$(flcurl -X POST "$fl_base/query/tasks" -H 'Content-Type: application/json' -d "$query" 2>/dev/null || true)"
+  still2="$(printf '%s' "$resp" | task_for_reg "$reg_id2")"
+  [ -z "$still2" ] && { gone=1; break; }
+  sleep 2
+done
+[ -n "$gone" ] || { echo "FAIL — Beoordelen task for $reg_id2 still active after withdrawal" >&2; docker logs "$dom" 2>&1 | tail -15 >&2; exit 1; }
+echo "OK — withdrawal cancelled the Beoordelen task; the registratie process ended (ingetrokken)"
 exit 0