diff --git a/scripts/orchestration/execution_context.py b/scripts/orchestration/execution_context.py
index 2eb7822..8a66feb 100644
--- a/scripts/orchestration/execution_context.py
+++ b/scripts/orchestration/execution_context.py
@@ -17,7 +17,8 @@
 from repository_preflight import capture_repository_evidence, task_caused_paths
 
 
-SOURCE_ID_RE = re.compile(r"^[A-Z][A-Z0-9_-]*-\d+$")
+SOURCE_ID_TOKEN = r"[A-Z][A-Z0-9_-]*-\d+[A-Z]?"
+SOURCE_ID_RE = re.compile(rf"^{SOURCE_ID_TOKEN}$")
 AUTH_ALIAS_RE = re.compile(r"^AUTH-\d{3}$")
 EXCELLENCE_PROPOSAL_RE = re.compile(r"^EXC-\d+$")
 SAFE_ID_RE = re.compile(r"^[A-Za-z0-9][A-Za-z0-9._-]*$")
@@ -441,15 +442,39 @@ def add(identifier: str, value: str) -> None:
         records[identifier] = value
 
     for line in body.splitlines():
-        bullet = re.match(r"^\s*[-*]\s+\*\*([A-Z][A-Z0-9_-]*-\d+)\*\*\s*:\s*(.+)$", line)
+        titled_bullet = re.match(
+            rf"^\s*[-*]\s+\*\*({SOURCE_ID_TOKEN})\s*[—-]\s*(.+?)(?::\*\*\s*|\*\*\s*:\s*)(.+)$",
+            line,
+        )
+        if titled_bullet:
+            title = titled_bullet.group(2).strip()
+            detail = titled_bullet.group(3).strip()
+            add(titled_bullet.group(1), f"{title}: {detail}")
+            continue
+        bullet = re.match(
+            rf"^\s*[-*]\s+\*\*({SOURCE_ID_TOKEN})(?::\*\*\s*|\*\*\s*:\s*)(.+)$",
+            line,
+        )
         if bullet:
             add(bullet.group(1), bullet.group(2))
             continue
-        heading = re.match(r"^#{2,6}\s+([A-Z][A-Z0-9_-]*-\d+)\s*(?:[:—-]\s*)?(.*)$", line)
+        titled_plain = re.match(
+            rf"^\s*\*\*({SOURCE_ID_TOKEN})\s*[—-]\s*(.+?)(?::\*\*\s*|\*\*\s*:\s*)(.+)$",
+            line,
+        )
+        if titled_plain:
+            title = titled_plain.group(2).strip()
+            detail = titled_plain.group(3).strip()
+            add(titled_plain.group(1), f"{title}: {detail}")
+            continue
+        heading = re.match(
+            rf"^#{{2,6}}\s+({SOURCE_ID_TOKEN})(?:(?:\s+[:—-]?\s*)|(?:[:—-]\s*))(.*)$",
+            line,
+        )
         if heading and heading.group(2).strip():
             add(heading.group(1), heading.group(2))
             continue
-        plain = re.match(r"^\s*([A-Z][A-Z0-9_-]*-\d+)\s*:\s*(.+)$", line)
+        plain = re.match(rf"^\s*({SOURCE_ID_TOKEN})\s*:\s*(.+)$", line)
         if plain:
             add(plain.group(1), plain.group(2))
             continue
diff --git a/tests/test_orchestration_execution_context.py b/tests/test_orchestration_execution_context.py
index 63a1423..34de1a7 100644
--- a/tests/test_orchestration_execution_context.py
+++ b/tests/test_orchestration_execution_context.py
@@ -19,6 +19,48 @@
 from execution_context import build_review_package, build_task_brief  # noqa: E402
 
 
+def test_source_records_keep_letter_suffixed_ids_distinct(tmp_path: Path) -> None:
+    specification = tmp_path / "spec.md"
+    body = (
+        "### API-003 — Descriptor and pagination\n"
+        "### API-003A — Closed resource identity inventory\n"
+        "- **AC-005A:** Closed applicability bindings.\n"
+        "- **AC-005B**: Legacy outside-colon form.\n"
+        "- **REQ-001 — Repair first:** Repair the prerelease schema.\n"
+        "**DELTA-017 — Accepted resolution:** Repair in place.\n"
+        "| AC-005C | Closed skill-to-rule edge inventory |\n"
+    )
+
+    records = execution_context._source_records(specification, body)
+
+    assert records == {
+        "API-003": "Descriptor and pagination",
+        "API-003A": "Closed resource identity inventory",
+        "AC-005A": "Closed applicability bindings.",
+        "AC-005B": "Legacy outside-colon form.",
+        "REQ-001": "Repair first: Repair the prerelease schema.",
+        "DELTA-017": "Accepted resolution: Repair in place.",
+        "AC-005C": "Closed skill-to-rule edge inventory",
+    }
+
+
+def test_source_records_reject_malformed_suffixes_and_colonless_bullets(tmp_path: Path) -> None:
+    specification = tmp_path / "spec.md"
+    body = (
+        "### API-003 — Descriptor and pagination\n"
+        "### API-003a — Lowercase suffix must not alias.\n"
+        "- **REQ-001** prose without a delimiter\n"
+    )
+
+    assert execution_context._source_records(specification, body) == {
+        "API-003": "Descriptor and pagination",
+    }
+    assert execution_context.SOURCE_ID_RE.fullmatch("API-003A")
+    assert not execution_context.SOURCE_ID_RE.fullmatch("API-003a")
+    assert not execution_context.SOURCE_ID_RE.fullmatch("API-003-A")
+    assert not execution_context.SOURCE_ID_RE.fullmatch("API-003AB")
+
+
 def test_compile_evidence_capability_maps_stable_task_local_invariants() -> None:
     validation = [{"id": "VAL-001", "invariant_ids": ["INV-001"], "capability_reason": "Observes violation."}]
     task = {"evidence_capability": {"result": "mapped", "reason": "Required.", "invariants": [{"id": "INV-001", "source_ids": ["REQ-001"], "invariant": "Observable behavior", "boundary": "unit", "oracle": "VAL-001", "capability_reason": "Unit oracle distinguishes violation.", "freshness": "current_task_batch", "task_id": "task-001", "evidence_ids": ["VAL-001"], "closure_result": "pending"}]}}