diff --git a/backend-compliance/compliance/api/canonical_control_routes.py b/backend-compliance/compliance/api/canonical_control_routes.py
index a87dac1..c97bee2 100644
--- a/backend-compliance/compliance/api/canonical_control_routes.py
+++ b/backend-compliance/compliance/api/canonical_control_routes.py
@@ -954,7 +954,7 @@ async def backfill_normative_strength(
 
         # 2. Normative strength korrigieren basierend auf source_type
         changes = []
-        stats = {"total": len(obligations), "unchanged": 0, "capped_to_should": 0, "capped_to_can": 0, "no_source": 0}
+        stats = {"total": len(obligations), "unchanged": 0, "capped_to_should": 0, "capped_to_may": 0, "no_source": 0}
 
         for obl in obligations:
             if not obl.parent_source:
@@ -975,8 +975,8 @@ async def backfill_normative_strength(
                 })
                 if new_strength == "should":
                     stats["capped_to_should"] += 1
-                elif new_strength == "can":
-                    stats["capped_to_can"] += 1
+                elif new_strength == "may":
+                    stats["capped_to_may"] += 1
             else:
                 stats["unchanged"] += 1
 
diff --git a/backend-compliance/compliance/data/source_type_classification.py b/backend-compliance/compliance/data/source_type_classification.py
index 7569524..fbfbe25 100644
--- a/backend-compliance/compliance/data/source_type_classification.py
+++ b/backend-compliance/compliance/data/source_type_classification.py
@@ -23,19 +23,20 @@ Mapping: source_regulation (aus control_parent_links) -> source_type
 # --- Typ-Definitionen ---
 SOURCE_TYPE_LAW = "law"           # Gesetz/Verordnung/Richtlinie — normative_strength bleibt
 SOURCE_TYPE_GUIDELINE = "guideline"  # Leitlinie/Standard — max "should"
-SOURCE_TYPE_FRAMEWORK = "framework"  # Framework/Best Practice — max "can"
+SOURCE_TYPE_FRAMEWORK = "framework"  # Framework/Best Practice — max "may"
 
 # Max erlaubte normative_strength pro source_type
+# DB-Constraint erlaubt: must, should, may (NICHT "can")
 NORMATIVE_STRENGTH_CAP: dict[str, str] = {
     SOURCE_TYPE_LAW: "must",       # keine Begrenzung
     SOURCE_TYPE_GUIDELINE: "should",  # max "should"
-    SOURCE_TYPE_FRAMEWORK: "can",     # max "can"
+    SOURCE_TYPE_FRAMEWORK: "may",     # max "may" (= "kann")
 }
 
 # Reihenfolge fuer Vergleiche (hoeher = staerker)
 STRENGTH_ORDER: dict[str, int] = {
-    "can": 1,
-    "may": 1,       # Alias fuer "can"
+    "may": 1,        # KANN (DB-Wert)
+    "can": 1,        # Alias — wird in cap_normative_strength zu "may" normalisiert
     "should": 2,
     "must": 3,
 }
@@ -46,7 +47,7 @@ def cap_normative_strength(original: str, source_type: str) -> str:
     Begrenzt die normative_strength basierend auf dem source_type.
 
     Beispiel:
-        cap_normative_strength("must", "framework") -> "can"
+        cap_normative_strength("must", "framework") -> "may"
         cap_normative_strength("should", "law") -> "should"
         cap_normative_strength("must", "guideline") -> "should"
     """
diff --git a/backend-compliance/tests/test_source_type_classification.py b/backend-compliance/tests/test_source_type_classification.py
index 503ca1c..a35b1e7 100644
--- a/backend-compliance/tests/test_source_type_classification.py
+++ b/backend-compliance/tests/test_source_type_classification.py
@@ -71,16 +71,16 @@ class TestCapNormativeStrength:
         assert cap_normative_strength("should", SOURCE_TYPE_GUIDELINE) == "should"
 
     def test_must_from_framework_capped(self):
-        assert cap_normative_strength("must", SOURCE_TYPE_FRAMEWORK) == "can"
+        assert cap_normative_strength("must", SOURCE_TYPE_FRAMEWORK) == "may"
 
     def test_should_from_framework_capped(self):
-        assert cap_normative_strength("should", SOURCE_TYPE_FRAMEWORK) == "can"
+        assert cap_normative_strength("should", SOURCE_TYPE_FRAMEWORK) == "may"
 
-    def test_can_from_framework_stays(self):
-        assert cap_normative_strength("can", SOURCE_TYPE_FRAMEWORK) == "can"
+    def test_may_from_framework_stays(self):
+        assert cap_normative_strength("may", SOURCE_TYPE_FRAMEWORK) == "may"
 
-    def test_can_from_law_stays(self):
-        assert cap_normative_strength("can", SOURCE_TYPE_LAW) == "can"
+    def test_may_from_law_stays(self):
+        assert cap_normative_strength("may", SOURCE_TYPE_LAW) == "may"
 
 
 class TestGetHighestSourceType:
diff --git a/docs-src/services/sdk-modules/normative-verbindlichkeit.md b/docs-src/services/sdk-modules/normative-verbindlichkeit.md
index 5f03f75..db3307a 100644
--- a/docs-src/services/sdk-modules/normative-verbindlichkeit.md
+++ b/docs-src/services/sdk-modules/normative-verbindlichkeit.md
@@ -159,7 +159,7 @@ Ablauf:
 ```python
 def cap_normative_strength(original: str, source_type: str) -> str:
     """
-    cap_normative_strength("must", "framework") → "can"
+    cap_normative_strength("must", "framework") → "may"
     cap_normative_strength("should", "law")     → "should"
     cap_normative_strength("must", "guideline") → "should"
     """
@@ -173,7 +173,7 @@ In der Control-Detail-Ansicht werden Obligations mit farbcodierten Badges angeze
 |---|---|---|---|
 | `must` | **MUSS** | Rot | Gesetzliche Pflicht |
 | `should` | **SOLL** | Gelb/Amber | Empfohlen, Begruendungspflicht bei Abweichung |
-| `can` / `may` | **KANN** | Gruen | Freiwillige Best Practice |
+| `may` | **KANN** | Gruen | Freiwillige Best Practice |
 
 ## Haeufige Fragen