diff --git a/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard.py b/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard.py
index 1b99160a3c8..1cdd2b4d9a6 100644
--- a/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard.py
+++ b/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard.py
@@ -146,11 +146,7 @@ class SupplierScorecard(Document):
 			frappe.db.set_value("Supplier", self.supplier, fieldname, self.get(fieldname))
 
 
-@frappe.whitelist()
-def get_timeline_data(doctype: str, name: str):
-	# Get a list of all the associated scorecards
-
-	out = {}
+def get_timeline_data(doctype: str, name: str) -> dict[float, float]:
 	timeline_data = {}
 
 	scorecards = frappe.get_all(
@@ -164,8 +160,7 @@ def get_timeline_data(doctype: str, name: str):
 		for single_date in daterange(sc.start_date, sc.end_date):
 			timeline_data[time.mktime(single_date.timetuple())] = sc.total_score
 
-	out["timeline_data"] = timeline_data
-	return out
+	return timeline_data
 
 
 def daterange(start_date, end_date):
diff --git a/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard_dashboard.py b/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard_dashboard.py
index e3557bd0d81..1cf87342449 100644
--- a/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard_dashboard.py
+++ b/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard_dashboard.py
@@ -6,6 +6,5 @@ def get_data():
 		"heatmap": True,
 		"heatmap_message": _("This covers all scorecards tied to this Setup"),
 		"fieldname": "supplier",
-		"method": "erpnext.buying.doctype.supplier_scorecard.supplier_scorecard.get_timeline_data",
 		"transactions": [{"label": _("Scorecards"), "items": ["Supplier Scorecard Period"]}],
 	}
diff --git a/erpnext/buying/doctype/supplier_scorecard/test_supplier_scorecard.py b/erpnext/buying/doctype/supplier_scorecard/test_supplier_scorecard.py
index f23940305e1..ced8b07c2b2 100644
--- a/erpnext/buying/doctype/supplier_scorecard/test_supplier_scorecard.py
+++ b/erpnext/buying/doctype/supplier_scorecard/test_supplier_scorecard.py
@@ -9,6 +9,7 @@ from erpnext.buying.doctype.supplier_scorecard.supplier_scorecard import (
 	get_scorecard_date,
 	make_all_scorecards,
 )
+from erpnext.buying.doctype.supplier_scorecard.supplier_scorecard_dashboard import get_data
 from erpnext.tests.utils import ERPNextTestSuite
 
 
@@ -89,6 +90,30 @@ class TestSupplierScorecard(ERPNextTestSuite):
 		self.assertGreater(created, 0)
 		self.assertEqual(make_all_scorecards(doc.name), 0)
 
+	def test_dashboard_endpoint_returns_connection_count_and_heatmap(self):
+		supplier = create_test_supplier("_Test Supplier SC Dashboard")
+		frappe.db.set_value("Supplier", supplier, "creation", add_days(nowdate(), -75))
+
+		frappe.delete_doc_if_exists("Supplier Scorecard", supplier)
+		doc = make_supplier_scorecard()
+		doc.supplier = supplier
+		doc.name = supplier
+		doc.insert()
+
+		endpoint = get_data().get("method") or "frappe.desk.notifications.get_open_count"
+		dashboard = frappe.get_attr(endpoint)("Supplier Scorecard", doc.name)
+
+		counts = {link["doctype"]: link["count"] for link in dashboard["count"]["external_links_found"]}
+		periods = frappe.db.count("Supplier Scorecard Period", {"supplier": supplier})
+		self.assertGreater(periods, 0)
+		self.assertEqual(counts["Supplier Scorecard Period"], periods)
+
+		timeline_data = dashboard["timeline_data"]
+		self.assertTrue(timeline_data)
+		for timestamp, score in timeline_data.items():
+			self.assertIsInstance(timestamp, int | float)
+			self.assertIsInstance(score, int | float)
+
 
 def make_supplier_scorecard():
 	my_doc = frappe.get_doc(valid_scorecard[0])