diff --git a/erpnext/accounts/doctype/financial_report_template/financial_report_engine.py b/erpnext/accounts/doctype/financial_report_template/financial_report_engine.py
index af45c1f3f8e..47c7e2e6366 100644
--- a/erpnext/accounts/doctype/financial_report_template/financial_report_engine.py
+++ b/erpnext/accounts/doctype/financial_report_template/financial_report_engine.py
@@ -565,18 +565,19 @@ class FinancialQueryBuilder:
 			frappe.qb.from_(acb_table)
 			.select(
 				acb_table.account,
-				(acb_table.debit - acb_table.credit).as_("balance"),
+				Sum(acb_table.debit - acb_table.credit).as_("balance"),
 			)
 			.where(acb_table.company == self.company)
 			.where(acb_table.account.isin(account_names))
 			.where(acb_table.period_closing_voucher == closing_voucher)
+			.groupby(acb_table.account)
 		)
 
 		query = self._apply_standard_filters(query, acb_table, "Account Closing Balance")
 		results = self._execute_with_permissions(query, "Account Closing Balance")
 
 		for row in results:
-			closing_balances[row["account"]] = row["balance"]
+			closing_balances[row["account"]] = row["balance"] or 0.0
 
 		return closing_balances
 
diff --git a/erpnext/accounts/doctype/financial_report_template/test_financial_report_engine.py b/erpnext/accounts/doctype/financial_report_template/test_financial_report_engine.py
index a90a5d32aad..01dcff7f57f 100644
--- a/erpnext/accounts/doctype/financial_report_template/test_financial_report_engine.py
+++ b/erpnext/accounts/doctype/financial_report_template/test_financial_report_engine.py
@@ -19,6 +19,7 @@ from erpnext.accounts.doctype.financial_report_template.test_financial_report_te
 )
 from erpnext.accounts.doctype.journal_entry.test_journal_entry import make_journal_entry
 from erpnext.accounts.utils import get_currency_precision, get_fiscal_year
+from erpnext.tests.utils import change_settings
 
 
 class TestDependencyResolver(FinancialReportTemplateTestCase):
@@ -1953,6 +1954,104 @@ class TestFinancialQueryBuilder(FinancialReportTemplateTestCase):
 
 			jv_2023.cancel()
 
+	@change_settings("Accounts Settings", {"use_legacy_controller_for_pcv": 1})
+	def test_opening_balance_sums_acb_rows_across_dimensions(self):
+		"""
+		Account Closing Balance stores one row per (account, cost_center,
+		project, finance_book). The closing-balance fetch must sum all rows.
+		"""
+		company = "_Test Company"
+		cash_account = "_Test Cash - _TC"
+		sales_account = "Sales - _TC"
+		cc_1 = "_Test Cost Center - _TC"
+		cc_2 = "_Test Cost Center 2 - _TC"
+		docs = []
+
+		try:
+			jv_2023_cc1 = make_journal_entry(
+				account1=cash_account,
+				account2=sales_account,
+				amount=3000,
+				posting_date="2023-06-15",
+				cost_center=cc_1,
+				company=company,
+				submit=True,
+			)
+			docs.append(jv_2023_cc1)
+			jv_2023_cc2 = make_journal_entry(
+				account1=cash_account,
+				account2=sales_account,
+				amount=2000,
+				posting_date="2023-06-15",
+				cost_center=cc_2,
+				company=company,
+				submit=True,
+			)
+			docs.append(jv_2023_cc2)
+
+			fy_2023 = get_fiscal_year("2023-06-15", company=company)
+
+			pcv = frappe.get_doc(
+				{
+					"doctype": "Period Closing Voucher",
+					"transaction_date": "2023-12-31",
+					"period_start_date": fy_2023[1],
+					"period_end_date": fy_2023[2],
+					"company": company,
+					"fiscal_year": fy_2023[0],
+					"cost_center": cc_1,
+					"closing_account_head": "Deferred Revenue - _TC",
+					"remarks": "Test multi-dim PCV",
+				}
+			)
+			pcv.insert()
+			pcv.submit()
+			docs.append(pcv)
+
+			jv_2024 = make_journal_entry(
+				account1=cash_account,
+				account2=sales_account,
+				amount=100,
+				posting_date="2024-01-15",
+				cost_center=cc_1,
+				company=company,
+				submit=True,
+			)
+			docs.append(jv_2024)
+
+			filters = {
+				"company": company,
+				"from_fiscal_year": "2024",
+				"to_fiscal_year": "2024",
+				"period_start_date": "2024-01-01",
+				"period_end_date": "2024-03-31",
+				"filter_based_on": "Date Range",
+				"periodicity": "Monthly",
+				"ignore_closing_entries": True,
+			}
+			periods = [
+				{"key": "2024_jan", "from_date": "2024-01-01", "to_date": "2024-01-31"},
+				{"key": "2024_feb", "from_date": "2024-02-01", "to_date": "2024-02-29"},
+				{"key": "2024_mar", "from_date": "2024-03-01", "to_date": "2024-03-31"},
+			]
+
+			query_builder = FinancialQueryBuilder(filters, periods)
+			accounts = [
+				frappe._dict({"name": cash_account, "account_name": "Cash", "account_number": "1001"}),
+			]
+
+			balances_data = query_builder.fetch_account_balances(accounts)
+			cash_data = balances_data.get(cash_account)
+			self.assertIsNotNone(cash_data, "Cash account must appear in results")
+
+			jan_cash = cash_data.get_period("2024_jan")
+			self.assertEqual(jan_cash.opening, 5000.0)
+			self.assertEqual(jan_cash.movement, 100.0)
+			self.assertEqual(jan_cash.closing, 5100.0)
+
+		finally:
+			self.cancel_docs(docs)
+
 	def test_opening_entries_roll_into_opening_after_period_closing(self):
 		"""
 		Sequence:
diff --git a/erpnext/accounts/doctype/financial_report_template/test_financial_report_template.py b/erpnext/accounts/doctype/financial_report_template/test_financial_report_template.py
index 9372c503d12..e3ca33a747e 100644
--- a/erpnext/accounts/doctype/financial_report_template/test_financial_report_template.py
+++ b/erpnext/accounts/doctype/financial_report_template/test_financial_report_template.py
@@ -9,6 +9,14 @@ from erpnext.tests.utils import ERPNextTestSuite
 class FinancialReportTemplateTestCase(ERPNextTestSuite):
 	"""Utility class with common setup and helper methods for all test classes"""
 
+	def cancel_docs(self, docs):
+		"""Cancel submitted docs in reverse creation order to avoid dependency issues."""
+		for doc in reversed(docs):
+			if doc:
+				doc.reload()
+				if doc.docstatus == 1:
+					doc.cancel()
+
 	def setUp(self):
 		"""Set up test data"""
 		self.create_test_template()