diff --git a/src/rtichoke/__init__.py b/src/rtichoke/__init__.py
index bc84b742..f489bb15 100644
--- a/src/rtichoke/__init__.py
+++ b/src/rtichoke/__init__.py
@@ -30,7 +30,7 @@
 )
 from rtichoke.discrimination.gains import plot_gains_curve as plot_gains_curve
 
-from rtichoke.calibration.calibration import (
+from rtichoke.calibration import (
     create_calibration_curve as create_calibration_curve,
     create_calibration_curve_times as create_calibration_curve_times,
 )
diff --git a/src/rtichoke/calibration/calibration.py b/src/rtichoke/calibration/calibration.py
index 2efbf57d..c809ed6d 100644
--- a/src/rtichoke/calibration/calibration.py
+++ b/src/rtichoke/calibration/calibration.py
@@ -99,7 +99,29 @@ def create_calibration_curve_times(
         "#585123",
     ],
 ) -> Figure:
-    """Creates a time-dependent Calibration Curve with a slider for different time horizons."""
+    """Create a time-dependent calibration curve across fixed horizons.
+
+    Raises:
+        ValueError: If a heuristic set requests adjusted censoring or treats
+            competing events as censored, which calibration does not support.
+    """
+
+    unsupported = [
+        heuristics
+        for heuristics in heuristics_sets
+        if heuristics.get("censoring_heuristic") == "adjusted"
+        or heuristics.get("competing_heuristic") == "adjusted_as_censored"
+    ]
+    if unsupported:
+        raise ValueError(
+            "Unsupported calibration heuristics: "
+            "create_calibration_curve_times() does not support "
+            "censoring_heuristic='adjusted' or "
+            "competing_heuristic='adjusted_as_censored'. "
+            "Use a supported heuristic combination such as "
+            "censoring_heuristic='excluded' with "
+            "competing_heuristic='adjusted_as_negative'."
+        )
 
     calibration_curve_list_times = _create_calibration_curve_list_times(
         probs,
diff --git a/tests/test_calibration_times.py b/tests/test_calibration_times.py
index 8e73c63a..6fbc86ed 100644
--- a/tests/test_calibration_times.py
+++ b/tests/test_calibration_times.py
@@ -1,5 +1,10 @@
 import numpy as np
+import pytest
+from rtichoke import create_calibration_curve_times as create_calibration_curve_times_top_level
 from rtichoke.calibration import create_calibration_curve_times
+from rtichoke.calibration.calibration import (
+    create_calibration_curve_times as create_calibration_curve_times_direct,
+)
 
 
 def test_create_calibration_curve_times():
@@ -53,3 +58,37 @@ def test_create_calibration_curve_times_unequal_size_populations():
     )
 
     assert {trace.name for trace in fig.data if trace.name} >= {"Train", "Test"}
+
+
+@pytest.mark.parametrize(
+    "entry_point",
+    [create_calibration_curve_times_top_level, create_calibration_curve_times_direct],
+)
+@pytest.mark.parametrize(
+    "heuristics",
+    [
+        {
+            "censoring_heuristic": "adjusted",
+            "competing_heuristic": "adjusted_as_negative",
+        },
+        {
+            "censoring_heuristic": "excluded",
+            "competing_heuristic": "adjusted_as_censored",
+        },
+    ],
+)
+def test_create_calibration_curve_times_rejects_unsupported_heuristics(
+    entry_point, heuristics
+):
+    probs = {"model_1": np.array([0.1, 0.2, 0.3, 0.4])}
+    reals = np.array([0, 1, 0, 1])
+    times = np.array([1.0, 2.0, 3.0, 4.0])
+
+    with pytest.raises(ValueError, match="Unsupported calibration heuristics"):
+        entry_point(
+            probs,
+            reals,
+            times,
+            fixed_time_horizons=[2.0],
+            heuristics_sets=[heuristics],
+        )