diff --git a/backend/services/operating_context.py b/backend/services/operating_context.py
index e122ce3..ede67fd 100644
--- a/backend/services/operating_context.py
+++ b/backend/services/operating_context.py
@@ -54,20 +54,27 @@ def _seed_ui_profile(archetype_key: str) -> dict[str, Any]:
     return resolve_ui_profile(archetype_key)
 
 
+def _normalize_ui_profile_capabilities(profile: dict[str, Any]) -> dict[str, Any]:
+    """Spiegelt resolve_ui_profile: omCapabilities aus dataSlices falls fehlend."""
+    result = dict(profile)
+    slices = list(result.get("dataSlices") or [])
+    caps = list(result.get("omCapabilities") or slices)
+    result["dataSlices"] = slices
+    result["omCapabilities"] = caps
+    return result
+
+
 def _resolve_ui_profile(archetype_key: str) -> dict[str, Any]:
     seed_profile = _seed_ui_profile(archetype_key)
     db_profile = _load_ui_profile_from_db(archetype_key)
     if not db_profile:
-        return seed_profile
+        return _normalize_ui_profile_capabilities(seed_profile)
 
     merged = {**seed_profile, **db_profile}
     if not (merged.get("omCapabilities") or merged.get("dataSlices")):
         seed_slices = seed_profile.get("dataSlices") or []
         merged["dataSlices"] = list(seed_slices)
-        merged["omCapabilities"] = list(
-            seed_profile.get("omCapabilities") or seed_slices
-        )
-    return merged
+    return _normalize_ui_profile_capabilities(merged)
 
 
 def _resolve_om_capabilities(ui_profile: dict[str, Any]) -> frozenset[str]: