diff --git a/app/Models/RuleAction.php b/app/Models/RuleAction.php
index eed2a1dc13..ae949c89d7 100644
--- a/app/Models/RuleAction.php
+++ b/app/Models/RuleAction.php
@@ -67,12 +67,12 @@ class RuleAction extends Model
 
     protected $casts
                         = [
-            'created_at'      => 'datetime',
-            'updated_at'      => 'datetime',
-            'active'          => 'boolean',
-            'order'           => 'int',
-            'stop_processing' => 'boolean',
-        ];
+                            'created_at'      => 'datetime',
+                            'updated_at'      => 'datetime',
+                            'active'          => 'boolean',
+                            'order'           => 'int',
+                            'stop_processing' => 'boolean',
+                        ];
 
     protected $fillable = ['rule_id', 'action_type', 'action_value', 'order', 'active', 'stop_processing'];
 
diff --git a/app/TransactionRules/Actions/SetAmount.php b/app/TransactionRules/Actions/SetAmount.php
new file mode 100644
index 0000000000..54501e6659
--- /dev/null
+++ b/app/TransactionRules/Actions/SetAmount.php
@@ -0,0 +1,127 @@
+<?php
+/*
+ * SetAmount.php
+ * Copyright (c) 2024 james@firefly-iii.org.
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\TransactionRules\Actions;
+
+use FireflyIII\Events\Model\Rule\RuleActionFailedOnArray;
+use FireflyIII\Events\TriggeredAuditLog;
+use FireflyIII\Models\RuleAction;
+use FireflyIII\Models\Transaction;
+use FireflyIII\Models\TransactionJournal;
+use FireflyIII\Support\Facades\Steam;
+use FireflyIII\TransactionRules\Traits\RefreshNotesTrait;
+
+class SetAmount implements ActionInterface
+{
+    use RefreshNotesTrait;
+    private RuleAction $action;
+
+    /**
+     * TriggerInterface constructor.
+     */
+    public function __construct(RuleAction $action)
+    {
+        $this->action = $action;
+    }
+
+    public function actOnArray(array $journal): bool
+    {
+        $this->refreshNotes($journal);
+
+        // not on slpit transactions
+        $groupCount = TransactionJournal::where('transaction_group_id', $journal['transaction_group_id'])->count();
+        if ($groupCount > 1) {
+            app('log')->error(sprintf('Group #%d has more than one transaction in it, cannot convert to transfer.', $journal['transaction_group_id']));
+            event(new RuleActionFailedOnArray($this->action, $journal, trans('rules.split_group')));
+
+            return false;
+        }
+
+        $value      = $this->action->getValue($journal);
+
+        if (!is_numeric($value) || '' === $value || 0 === bccomp((string)$value, '0')) {
+            app('log')->debug(sprintf('RuleAction SetAmount, amount "%s" is not a number or is zero, will not continue.', $value));
+            event(new RuleActionFailedOnArray($this->action, $journal, trans('rules.journal_invalid_amount', ['amount' => $value])));
+
+            return false;
+        }
+
+        /** @var TransactionJournal $object */
+        $object     = TransactionJournal::where('user_id', $journal['user_id'])->find($journal['transaction_journal_id']);
+
+        // doesn't actually do anything!
+        $positive   = Steam::positive($value);
+        $negative   = Steam::negative($value);
+
+        $this->updatePositive($object, $positive);
+        $this->updateNegative($object, $negative);
+        $object->transactionGroup->touch();
+
+        // event for audit log entry
+
+        event(new TriggeredAuditLog(
+            $this->action->rule,
+            $object,
+            'update_amount',
+            [
+                'currency_symbol' => $object->transactionCurrency->symbol,
+                'decimal_places'  => $object->transactionCurrency->decimal_places,
+                'amount'          => $journal['amount'],
+            ],
+            [
+                'currency_symbol' => $object->transactionCurrency->symbol,
+                'decimal_places'  => $object->transactionCurrency->decimal_places,
+                'amount'          => $value,
+            ]
+        ));
+
+        return true;
+    }
+
+    private function updatePositive(TransactionJournal $object, string $amount): void
+    {
+        /** @var null|Transaction $transaction */
+        $transaction = $object->transactions()->where('amount', '>', 0)->first();
+        if (null === $transaction) {
+            return;
+        }
+        $this->updateAmount($transaction, $amount);
+    }
+
+    private function updateNegative(TransactionJournal $object, string $amount): void
+    {
+        /** @var null|Transaction $transaction */
+        $transaction = $object->transactions()->where('amount', '<', 0)->first();
+        if (null === $transaction) {
+            return;
+        }
+        $this->updateAmount($transaction, $amount);
+    }
+
+    private function updateAmount(Transaction $transaction, string $amount): void
+    {
+        $transaction->amount = $amount;
+        $transaction->save();
+        $transaction->transactionJournal->touch();
+    }
+}
diff --git a/app/TransactionRules/Expressions/ActionExpression.php b/app/TransactionRules/Expressions/ActionExpression.php
index 1e089ad0e4..40708487fe 100644
--- a/app/TransactionRules/Expressions/ActionExpression.php
+++ b/app/TransactionRules/Expressions/ActionExpression.php
@@ -30,31 +30,31 @@ use Symfony\Component\ExpressionLanguage\SyntaxError;
 class ActionExpression
 {
     private static array $NAMES = [
-        'transaction_group_id',
-        'user_id',
-        'user_group_id',
+        //        'transaction_group_id',
+        //        'user_id',
+        //        'user_group_id',
         'created_at',
         'updated_at',
         'transaction_group_title',
         'group_created_at',
         'group_updated_at',
-        'transaction_journal_id',
-        'transaction_type_id',
+        //        'transaction_journal_id',
+        //        'transaction_type_id',
         'description',
         'date',
-        'order',
+        //        'order',
         'transaction_type_type',
-        'source_transaction_id',
+        //        'source_transaction_id',
         'source_account_id',
-        'reconciled',
+        //        'reconciled',
         'amount',
-        'currency_id',
+        //        'currency_id',
         'currency_code',
         'currency_name',
         'currency_symbol',
         'currency_decimal_places',
         'foreign_amount',
-        'foreign_currency_id',
+        //        'foreign_currency_id',
         'foreign_currency_code',
         'foreign_currency_name',
         'foreign_currency_symbol',
@@ -71,14 +71,14 @@ class ActionExpression
         'budget_id',
         'budget_name',
         'tags',
-        'attachments',
+        //        'attachments',
         'interest_date',
         'payment_date',
         'invoice_date',
         'book_date',
         'due_date',
         'process_date',
-        'destination_transaction_id',
+        //        'destination_transaction_id',
         'notes',
     ];
 
diff --git a/app/TransactionRules/Expressions/ActionExpressionLanguageProvider.php b/app/TransactionRules/Expressions/ActionExpressionLanguageProvider.php
index 03b3d69970..a608fc6848 100644
--- a/app/TransactionRules/Expressions/ActionExpressionLanguageProvider.php
+++ b/app/TransactionRules/Expressions/ActionExpressionLanguageProvider.php
@@ -32,24 +32,34 @@ class ActionExpressionLanguageProvider implements ExpressionFunctionProviderInte
     public function getFunctions(): array
     {
         return [
-            new ExpressionFunction('constant', function ($str): string {
-                return sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str.'!');
-            }, function ($arguments, $str): string {
-                if (!is_string($str)) {
-                    return $str;
-                }
+            new ExpressionFunction(
+                'constant',
+                function ($str): string {
+                    return sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str.'!');
+                },
+                // @SuppressWarnings(PHPMD.UnusedFormalParameter)
+                function ($arguments, $str): string {
+                    if (!is_string($str)) {
+                        return (string) $str;
+                    }
 
-                return strtolower($str.'!');
-            }),
-            new ExpressionFunction('enum', function ($str): string {
-                return sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str.'?');
-            }, function ($arguments, $str): string {
-                if (!is_string($str)) {
-                    return $str;
+                    return strtolower($str.'!');
                 }
+            ),
+            new ExpressionFunction(
+                'enum',
+                function ($str): string {
+                    return sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str.'?');
+                },
+                // @SuppressWarnings(PHPMD.UnusedFormalParameter)
+                function ($arguments, $str): string {
+                    if (!is_string($str)) {
+                        return (string) $str;
+                    }
 
-                return strtolower($str).'?';
-            }),
+                    return strtolower($str).'?';
+                }
+            ),
 
             ExpressionFunction::fromPhp('substr'),
             ExpressionFunction::fromPhp('strlen'),
diff --git a/app/Transformers/V2/AccountTransformer.php b/app/Transformers/V2/AccountTransformer.php
index 727c1962ef..4e0fb1e6c0 100644
--- a/app/Transformers/V2/AccountTransformer.php
+++ b/app/Transformers/V2/AccountTransformer.php
@@ -91,7 +91,7 @@ class AccountTransformer extends AbstractTransformer
 
         // TODO needs separate method.
         $sort                    = $this->parameters->get('sort');
-        if (count($sort) > 0) {
+        if (is_countable($sort) && count($sort) > 0) {
             foreach ($sort as $column => $direction) {
                 // account_number + iban
                 if ('iban' === $column) {
diff --git a/app/Validation/FireflyValidator.php b/app/Validation/FireflyValidator.php
index 9517d92188..9331479b7b 100644
--- a/app/Validation/FireflyValidator.php
+++ b/app/Validation/FireflyValidator.php
@@ -829,7 +829,8 @@ class FireflyValidator extends Validator
                 ->where('trigger', $trigger)
                 ->where('response', $response)
                 ->where('delivery', $delivery)
-                ->where('url', $url)->count();
+                ->where('url', $url)->count()
+            ;
         }
 
         return false;
diff --git a/config/firefly.php b/config/firefly.php
index 4c081b593e..fa0ee36959 100644
--- a/config/firefly.php
+++ b/config/firefly.php
@@ -83,6 +83,7 @@ use FireflyIII\TransactionRules\Actions\PrependDescription;
 use FireflyIII\TransactionRules\Actions\PrependNotes;
 use FireflyIII\TransactionRules\Actions\RemoveAllTags;
 use FireflyIII\TransactionRules\Actions\RemoveTag;
+use FireflyIII\TransactionRules\Actions\SetAmount;
 use FireflyIII\TransactionRules\Actions\SetBudget;
 use FireflyIII\TransactionRules\Actions\SetCategory;
 use FireflyIII\TransactionRules\Actions\SetDescription;
@@ -109,11 +110,11 @@ return [
     ],
     // some feature flags:
     'feature_flags'                => [
-        'export'       => true,
-        'telemetry'    => false,
-        'webhooks'     => true,
-        'handle_debts' => true,
-        'expression_engine' => false,
+        'export'            => true,
+        'telemetry'         => false,
+        'webhooks'          => true,
+        'handle_debts'      => true,
+        'expression_engine' => true,
         // see cer.php for exchange rates feature flag.
     ],
     'version'                      => 'develop/2024-03-07',
@@ -521,6 +522,9 @@ return [
         'move_notes_to_descr'     => MoveNotesToDescription::class,
         'set_source_to_cash'      => SetSourceToCashAccount::class,
         'set_destination_to_cash' => SetDestinationToCashAccount::class,
+        'set_amount'              => SetAmount::class,
+        // 'set_foreign_amount' => SetForeignAmount::class,
+        // 'set_foreign_currency' => SetForeignCurrency::class,
     ],
     'context-rule-actions'         => [
         'set_category',
diff --git a/resources/lang/en_US/firefly.php b/resources/lang/en_US/firefly.php
index 66accd2b86..caf38e16cb 100644
--- a/resources/lang/en_US/firefly.php
+++ b/resources/lang/en_US/firefly.php
@@ -1250,6 +1250,8 @@ return [
     'rule_action_append_notes_to_descr'                   => 'Append notes to description',
     'rule_action_move_descr_to_notes'                     => 'Replace notes with description',
     'rule_action_move_notes_to_descr'                     => 'Replace description with notes',
+    'rule_action_set_amount_choice'                       => 'Set amount to ..',
+    'rule_action_set_amount'                              => 'Set amount to ":action_value"',
     'rule_action_set_destination_to_cash_choice'          => 'Set destination account to (cash)',
     'rule_action_set_source_to_cash_choice'               => 'Set source account to (cash)',
     'rulegroup_for_bills_title'                           => 'Rule group for bills',
@@ -2678,6 +2680,7 @@ return [
     'ale_action_add_to_piggy'                             => 'Piggy bank',
     'ale_action_remove_from_piggy'                        => 'Piggy bank',
     'ale_action_add_tag'                                  => 'Added tag',
+    'ale_action_update_amount'                            => 'Updated amount',
 
     // dashboard
     'enable_auto_convert'                                 => 'Enable currency conversion',
diff --git a/resources/lang/en_US/rules.php b/resources/lang/en_US/rules.php
index 8d4b44ad76..020162caf3 100644
--- a/resources/lang/en_US/rules.php
+++ b/resources/lang/en_US/rules.php
@@ -70,4 +70,5 @@ return [
     'cannot_find_budget'                          => 'Firefly III can\'t find budget ":name"',
     'cannot_find_category'                        => 'Firefly III can\'t find category ":name"',
     'cannot_set_budget'                           => 'Firefly III can\'t set budget ":name" to a transaction of type ":type"',
+    'journal_invalid_amount'                      => 'Firefly III can\'t set amount ":amount" because it is not a valid number.',
 ];
diff --git a/resources/views/list/ale.twig b/resources/views/list/ale.twig
index 3632ec3bd1..09433efa82 100644
--- a/resources/views/list/ale.twig
+++ b/resources/views/list/ale.twig
@@ -22,6 +22,12 @@
                     <code>{{ logEntry.after }}</code>
                 {% endif %}
 
+                {% if 'update_amount' == logEntry.action %}
+                    {{ formatAmountBySymbol(logEntry.before.amount, logEntry.before.currency_symbol, logEntry.before.decimal_places, true) }}
+                    &rarr;
+                    {{ formatAmountBySymbol(logEntry.after.amount, logEntry.after.currency_symbol, logEntry.after.decimal_places, true) }}
+                {% endif %}
+
                 {% if 'update_group_title' == logEntry.action %}
                     <code><s>{{ logEntry.before }}</s></code>
                     &rarr;