diff --git a/app/core/retrieval/retriever.py b/app/core/retrieval/retriever.py
index 54e8d63..c6926f5 100644
--- a/app/core/retrieval/retriever.py
+++ b/app/core/retrieval/retriever.py
@@ -232,7 +232,8 @@ def _build_explanation(
         top_edges = sorted(edges_dto, key=lambda e: e.confidence, reverse=True)
         for e in top_edges[:3]:
             peer = e.source if e.direction == "in" else e.target
-            prov_txt = "Bestätigte" if e.provenance == "explicit" else "KI-basierte"
+            # WP-24c v4.5.3: Unterstütze alle explicit-Varianten (explicit, explicit:callout, etc.)
+            prov_txt = "Bestätigte" if e.provenance and e.provenance.startswith("explicit") else "KI-basierte"
             boost_txt = f" [Boost x{applied_boosts.get(e.kind)}]" if applied_boosts and e.kind in applied_boosts else ""
             
             reasons.append(Reason(
diff --git a/app/models/dto.py b/app/models/dto.py
index 23221e1..15d6eea 100644
--- a/app/models/dto.py
+++ b/app/models/dto.py
@@ -46,7 +46,14 @@ class EdgeDTO(BaseModel):
     target: str
     weight: float
     direction: Literal["out", "in", "undirected"] = "out"
-    provenance: Optional[Literal["explicit", "rule", "smart", "structure"]] = "explicit"
+    # WP-24c v4.5.3: Erweiterte Provenance-Werte für Chunk-Aware Edges
+    # Unterstützt alle tatsächlich verwendeten Provenance-Typen im System
+    provenance: Optional[Literal[
+        "explicit", "rule", "smart", "structure",
+        "explicit:callout", "explicit:wikilink", "explicit:note_zone", "explicit:note_scope",
+        "inline:rel", "callout:edge", "semantic_ai", "structure:belongs_to", "structure:order",
+        "derived:backlink", "edge_defaults", "global_pool"
+    ]] = "explicit"
     confidence: float = 1.0
     target_section: Optional[str] = None