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diff --git a/src/exchangedb/exchange_do_batch_withdraw_insert.sql b/src/exchangedb/exchange_do_batch_withdraw_insert.sql
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+--
+-- This file is part of TALER
+-- Copyright (C) 2014--2022 Taler Systems SA
+--
+-- TALER is free software; you can redistribute it and/or modify it under the
+-- terms of the GNU General Public License as published by the Free Software
+-- Foundation; either version 3, or (at your option) any later version.
+--
+-- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+-- A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License along with
+-- TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+--
+
+CREATE OR REPLACE FUNCTION exchange_do_batch_withdraw_insert(
+ IN cs_nonce BYTEA,
+ IN amount taler_amount,
+ IN h_denom_pub BYTEA, -- FIXME: denom_serials should really be a parameter to this FUNCTION.
+ IN ruuid INT8,
+ IN reserve_sig BYTEA,
+ IN h_coin_envelope BYTEA,
+ IN denom_sig BYTEA,
+ IN now INT8,
+ OUT out_denom_unknown BOOLEAN,
+ OUT out_nonce_reuse BOOLEAN,
+ OUT out_conflict BOOLEAN)
+LANGUAGE plpgsql
+AS $$
+DECLARE
+ denom_serial INT8;
+BEGIN
+-- Shards: reserves by reserve_pub (SELECT)
+-- reserves_out (INSERT, with CONFLICT detection) by wih
+-- reserves by reserve_pub (UPDATE)
+-- reserves_in by reserve_pub (SELECT)
+-- wire_targets by wire_target_h_payto
+
+out_denom_unknown=TRUE;
+out_conflict=TRUE;
+out_nonce_reuse=TRUE;
+
+-- FIXME: denom_serials should really be a parameter to this FUNCTION.
+
+SELECT denominations_serial
+ INTO denom_serial
+ FROM exchange.denominations
+ WHERE denom_pub_hash=h_denom_pub;
+
+IF NOT FOUND
+THEN
+ -- denomination unknown, should be impossible!
+ out_denom_unknown=TRUE;
+ ASSERT false, 'denomination unknown';
+ RETURN;
+END IF;
+out_denom_unknown=FALSE;
+
+INSERT INTO exchange.reserves_out
+ (h_blind_ev
+ ,denominations_serial
+ ,denom_sig
+ ,reserve_uuid
+ ,reserve_sig
+ ,execution_date
+ ,amount_with_fee)
+VALUES
+ (h_coin_envelope
+ ,denom_serial
+ ,denom_sig
+ ,ruuid
+ ,reserve_sig
+ ,now
+ ,amount)
+ON CONFLICT DO NOTHING;
+
+IF NOT FOUND
+THEN
+ out_conflict=TRUE;
+ RETURN;
+END IF;
+out_conflict=FALSE;
+
+-- Special actions needed for a CS withdraw?
+out_nonce_reuse=FALSE;
+IF NOT NULL cs_nonce
+THEN
+ -- Cache CS signature to prevent replays in the future
+ -- (and check if cached signature exists at the same time).
+ INSERT INTO exchange.cs_nonce_locks
+ (nonce
+ ,max_denomination_serial
+ ,op_hash)
+ VALUES
+ (cs_nonce
+ ,denom_serial
+ ,h_coin_envelope)
+ ON CONFLICT DO NOTHING;
+
+ IF NOT FOUND
+ THEN
+ -- See if the existing entry is identical.
+ SELECT 1
+ FROM exchange.cs_nonce_locks
+ WHERE nonce=cs_nonce
+ AND op_hash=h_coin_envelope;
+ IF NOT FOUND
+ THEN
+ out_nonce_reuse=TRUE;
+ ASSERT false, 'nonce reuse attempted by client';
+ RETURN;
+ END IF;
+ END IF;
+END IF;
+
+END $$;
+
+COMMENT ON FUNCTION exchange_do_batch_withdraw_insert(BYTEA, taler_amount, BYTEA, INT8, BYTEA, BYTEA, BYTEA, INT8)
+ IS 'Stores information about a planchet for a batch withdraw operation. Checks if the planchet already exists, and in that case indicates a conflict';