diff --git a/brmbar3/schema/0023-inventory-balance.sql b/brmbar3/schema/0023-inventory-balance.sql
new file mode 100644
index 0000000..0feb637
--- /dev/null
+++ b/brmbar3/schema/0023-inventory-balance.sql
@@ -0,0 +1,94 @@
+--
+-- 0023-inventory-balance.sql
+--
+-- #23 - stored function for total inventory balance
+--
+-- ISC License
+--
+-- Copyright 2023-2025 Brmlab, z.s.
+-- TMA <tma+hs@jikos.cz>
+--
+-- Permission to use, copy, modify, and/or distribute this software
+-- for any purpose with or without fee is hereby granted, provided
+-- that the above copyright notice and this permission notice appear
+-- in all copies.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+-- WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+-- WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+-- AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+-- CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+-- OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+-- NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+--
+
+-- To require fully-qualified names
+SELECT pg_catalog.set_config('search_path', '', false);
+
+DO $upgrade_block$
+BEGIN
+
+IF brmbar_privileged.has_exact_schema_version(22) THEN
+
+CREATE OR REPLACE VIEW brmbar_privileged.debit_balances AS
+SELECT
+	ts.account AS debit_account,
+	SUM(ts.amount) AS debit_sum
+FROM public.transaction_splits ts
+WHERE (ts.side = 'debit'::public.transaction_split_side)
+GROUP BY ts.account;
+
+CREATE OR REPLACE VIEW brmbar_privileged.credit_balances AS
+SELECT
+	ts.account AS credit_account,
+	SUM(ts.amount) AS credit_sum
+FROM public.transaction_splits ts
+WHERE (ts.side = 'credit'::public.transaction_split_side)
+GROUP BY ts.account;
+
+/*
+        CASE
+            WHEN (ts.side = 'credit'::public.transaction_split_side) THEN (- ts.amount)
+            ELSE ts.amount
+        END AS amount,
+    a.currency,
+    ts.memo
+   FROM (public.transaction_splits ts
+     LEFT JOIN public.accounts a ON ((a.id = ts.account)))
+  ORDER BY ts.id;
+*/
+
+CREATE OR REPLACE FUNCTION public.inventory_balance()
+RETURNS DECIMAL(12,2)
+VOLATILE  NOT LEAKPROOF  LANGUAGE plpgsql AS $fn$
+DECLARE
+	rv DECIMAL(12,2);
+BEGIN
+	WITH inventory_balances AS (
+		SELECT COALESCE(credit_sum, 0) * public.find_buy_rate(a.currency, 1) as credit_sum,
+		COALESCE(debit_sum, 0) * public.find_buy_rate(a.currency, 1) as debit_sum,
+		COALESCE(credit_account, debit_account) as cd_account
+		FROM brmbar_privileged.credit_balances cb
+			FULL OUTER JOIN brmbar_privileged.debit_balances db
+			ON (debit_account = credit_account)
+			LEFT JOIN public.accounts a
+			ON (a.id = COALESCE(credit_account, debit_account))
+		WHERE a.acctype = 'inventory'::public.account_type
+	)
+	SELECT SUM(debit_sum) - SUM(credit_sum) INTO rv
+	FROM inventory_balances;
+
+	RETURN rv;
+END;
+$fn$;
+
+
+
+PERFORM brmbar_privileged.upgrade_schema_version_to(23);
+END IF;
+
+END;
+$upgrade_block$;
+
+-- vim: set ft=plsql :