diff --git a/Classes/Hooks/Datahandler/CommandMapBeforeStartHook.php b/Classes/Hooks/Datahandler/CommandMapBeforeStartHook.php
index 91287333..e6f2a52e 100644
--- a/Classes/Hooks/Datahandler/CommandMapBeforeStartHook.php
+++ b/Classes/Hooks/Datahandler/CommandMapBeforeStartHook.php
@@ -17,6 +17,7 @@
 use B13\Container\Domain\Service\ContainerService;
 use B13\Container\Tca\Registry;
 use Symfony\Component\DependencyInjection\Attribute\Autoconfigure;
+use TYPO3\CMS\Backend\Utility\BackendUtility;
 use TYPO3\CMS\Core\DataHandling\DataHandler;
 
 #[Autoconfigure(public: true)]
@@ -36,6 +37,9 @@ public function processCmdmap_beforeStart(DataHandler $dataHandler): void
         $dataHandler->cmdmap = $this->rewriteSimpleCommandMap($dataHandler->cmdmap);
         $dataHandler->cmdmap = $this->setContainerIdToZeroIfNotSetOnUpdate($dataHandler->cmdmap);
         $this->unsetInconsistentCopyOrMoveCommands($dataHandler);
+        // children are copied/moved together with their container (CommandMapPostProcessingHook),
+        // an additional command for a child would duplicate it (e.g. "select all" in Record module)
+        $this->unsetCopyOrMoveCommandsForChildrenOfContainersInCmdmap($dataHandler);
         // previously page id is used for copy/moving element at top of a container colum
         // but this leeds to wrong sorting in page context (e.g. List-Module)
         $dataHandler->cmdmap = $this->rewriteCommandMapTargetForTopAtContainer($dataHandler->cmdmap);
@@ -89,6 +93,62 @@ protected function unsetInconsistentCopyOrMoveCommands(DataHandler $dataHandler)
         }
     }
 
+    protected function unsetCopyOrMoveCommandsForChildrenOfContainersInCmdmap(DataHandler $dataHandler): void
+    {
+        $commands = $dataHandler->cmdmap['tt_content'] ?? [];
+        if (count($commands) < 2) {
+            return;
+        }
+        $workspaceId = (int)($dataHandler->BE_USER->workspace ?? 0);
+        foreach ($commands as $id => $cmds) {
+            if (!is_array($cmds)) {
+                continue;
+            }
+            foreach (['copy', 'move'] as $operation) {
+                if (!isset($cmds[$operation])) {
+                    continue;
+                }
+                if ($this->hasAncestorContainerWithSameCommand((int)$id, $operation, $cmds[$operation], $commands, $workspaceId)) {
+                    unset($dataHandler->cmdmap['tt_content'][$id][$operation]);
+                }
+            }
+            if (empty($dataHandler->cmdmap['tt_content'][$id])) {
+                unset($dataHandler->cmdmap['tt_content'][$id]);
+            }
+        }
+    }
+
+    /**
+     * a child command is only redundant if it is identical to the command of one of its containers,
+     * a child with an own target (e.g. pasted into another container) is kept
+     */
+    protected function hasAncestorContainerWithSameCommand(int $id, string $operation, mixed $command, array $commands, int $workspaceId): bool
+    {
+        $visited = [$id => true];
+        $parentId = $this->fetchContainerParent($id, $workspaceId);
+        while ($parentId > 0 && !isset($visited[$parentId])) {
+            if (isset($commands[$parentId][$operation]) && $commands[$parentId][$operation] == $command) {
+                return true;
+            }
+            $visited[$parentId] = true;
+            $parentId = $this->fetchContainerParent($parentId, $workspaceId);
+        }
+        return false;
+    }
+
+    protected function fetchContainerParent(int $uid, int $workspaceId): int
+    {
+        $record = $this->database->fetchOneRecord($uid);
+        if ($record !== null && $workspaceId > 0) {
+            // the child may have been moved in/out of a container in the workspace
+            BackendUtility::workspaceOL('tt_content', $record, $workspaceId, true);
+        }
+        if (!is_array($record)) {
+            return 0;
+        }
+        return (int)($record['tx_container_parent'] ?? 0);
+    }
+
     protected function setContainerIdToZeroIfNotSetOnUpdate(array $cmdmap): array
     {
         if (!empty($cmdmap['tt_content'])) {
diff --git a/Tests/Functional/Datahandler/DefaultLanguage/ContainerWithChildrenInCmdmapTest.php b/Tests/Functional/Datahandler/DefaultLanguage/ContainerWithChildrenInCmdmapTest.php
new file mode 100644
index 00000000..7f300588
--- /dev/null
+++ b/Tests/Functional/Datahandler/DefaultLanguage/ContainerWithChildrenInCmdmapTest.php
@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+namespace B13\Container\Tests\Functional\Datahandler\DefaultLanguage;
+
+/*
+ * This file is part of TYPO3 CMS-based extension "container" by b13.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ */
+
+use B13\Container\Tests\Functional\Datahandler\AbstractDatahandler;
+use PHPUnit\Framework\Attributes\Test;
+
+/**
+ * container and its children are part of the same cmdmap,
+ * e.g. "select all" and paste in the Record module (clipboard reverses the order)
+ */
+class ContainerWithChildrenInCmdmapTest extends AbstractDatahandler
+{
+    #[Test]
+    public function copyContainerWithChildrenInCmdmapCopiesChildrenOnlyOnce(): void
+    {
+        $this->importCSVDataSet(__DIR__ . '/Fixtures/ContainerWithChildrenInCmdmap/Container.csv');
+        $cmdmap = [
+            'tt_content' => [
+                3 => ['copy' => 3],
+                2 => ['copy' => 3],
+                1 => ['copy' => 3],
+            ],
+        ];
+        $this->dataHandler->start([], $cmdmap, $this->backendUser);
+        $this->dataHandler->process_cmdmap();
+        self::assertCSVDataSet(__DIR__ . '/Fixtures/ContainerWithChildrenInCmdmap/CopyContainerWithChildrenInCmdmapCopiesChildrenOnlyOnceResult.csv');
+    }
+
+    #[Test]
+    public function moveContainerWithChildrenInCmdmapKeepsChildrenInContainer(): void
+    {
+        $this->importCSVDataSet(__DIR__ . '/Fixtures/ContainerWithChildrenInCmdmap/Container.csv');
+        $cmdmap = [
+            'tt_content' => [
+                3 => ['move' => 3],
+                2 => ['move' => 3],
+                1 => ['move' => 3],
+            ],
+        ];
+        $this->dataHandler->start([], $cmdmap, $this->backendUser);
+        $this->dataHandler->process_cmdmap();
+        self::assertCSVDataSet(__DIR__ . '/Fixtures/ContainerWithChildrenInCmdmap/MoveContainerWithChildrenInCmdmapKeepsChildrenInContainerResult.csv');
+    }
+
+    #[Test]
+    public function copyNestedContainerWithChildrenInCmdmapCopiesChildrenOnlyOnce(): void
+    {
+        $this->importCSVDataSet(__DIR__ . '/Fixtures/ContainerWithChildrenInCmdmap/NestedContainer.csv');
+        $cmdmap = [
+            'tt_content' => [
+                3 => ['copy' => 3],
+                2 => ['copy' => 3],
+                1 => ['copy' => 3],
+            ],
+        ];
+        $this->dataHandler->start([], $cmdmap, $this->backendUser);
+        $this->dataHandler->process_cmdmap();
+        self::assertCSVDataSet(__DIR__ . '/Fixtures/ContainerWithChildrenInCmdmap/CopyNestedContainerWithChildrenInCmdmapCopiesChildrenOnlyOnceResult.csv');
+    }
+}
diff --git a/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/Container.csv b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/Container.csv
new file mode 100644
index 00000000..a8ad5c29
--- /dev/null
+++ b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/Container.csv
@@ -0,0 +1,9 @@
+"pages"
+,"uid","pid","title"
+,1,0,"page-1"
+,3,0,"page-2"
+"tt_content"
+,"uid","pid","CType","header","sorting","sys_language_uid","colPos","tx_container_parent","l18n_parent"
+,1,1,"b13-2cols-with-header-container","container",64,0,0,0,0
+,2,1,"header","col-200",128,0,200,1,0
+,3,1,"header","col-201",192,0,201,1,0
diff --git a/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/CopyContainerWithChildrenInCmdmapCopiesChildrenOnlyOnceResult.csv b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/CopyContainerWithChildrenInCmdmapCopiesChildrenOnlyOnceResult.csv
new file mode 100644
index 00000000..8a812ce3
--- /dev/null
+++ b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/CopyContainerWithChildrenInCmdmapCopiesChildrenOnlyOnceResult.csv
@@ -0,0 +1,12 @@
+"pages"
+,"uid","pid","title"
+,1,0,"page-1"
+,3,0,"page-2"
+"tt_content"
+,"uid","pid","CType","header","sorting","sys_language_uid","colPos","tx_container_parent","l18n_parent"
+,1,1,"b13-2cols-with-header-container","container",64,0,0,0,0
+,2,1,"header","col-200",128,0,200,1,0
+,3,1,"header","col-201",192,0,201,1,0
+,4,3,"b13-2cols-with-header-container","container",256,0,0,0,0
+,5,3,"header","col-200",512,0,200,4,0
+,6,3,"header","col-201",768,0,201,4,0
diff --git a/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/CopyNestedContainerWithChildrenInCmdmapCopiesChildrenOnlyOnceResult.csv b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/CopyNestedContainerWithChildrenInCmdmapCopiesChildrenOnlyOnceResult.csv
new file mode 100644
index 00000000..50f7e949
--- /dev/null
+++ b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/CopyNestedContainerWithChildrenInCmdmapCopiesChildrenOnlyOnceResult.csv
@@ -0,0 +1,12 @@
+"pages"
+,"uid","pid","title"
+,1,0,"page-1"
+,3,0,"page-2"
+"tt_content"
+,"uid","pid","CType","header","sorting","sys_language_uid","colPos","tx_container_parent","l18n_parent"
+,1,1,"b13-2cols-with-header-container","container",64,0,0,0,0
+,2,1,"b13-2cols-with-header-container","child-container",128,0,200,1,0
+,3,1,"header","content-in-child-container",192,0,200,2,0
+,4,3,"b13-2cols-with-header-container","container",256,0,0,0,0
+,5,3,"b13-2cols-with-header-container","child-container",512,0,200,4,0
+,6,3,"header","content-in-child-container",768,0,200,5,0
diff --git a/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/MoveContainerWithChildrenInCmdmapKeepsChildrenInContainerResult.csv b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/MoveContainerWithChildrenInCmdmapKeepsChildrenInContainerResult.csv
new file mode 100644
index 00000000..9681cd72
--- /dev/null
+++ b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/MoveContainerWithChildrenInCmdmapKeepsChildrenInContainerResult.csv
@@ -0,0 +1,9 @@
+"pages"
+,"uid","pid","title"
+,1,0,"page-1"
+,3,0,"page-2"
+"tt_content"
+,"uid","pid","CType","header","sorting","sys_language_uid","colPos","tx_container_parent","l18n_parent"
+,1,3,"b13-2cols-with-header-container","container",256,0,0,0,0
+,2,3,"header","col-200",512,0,200,1,0
+,3,3,"header","col-201",768,0,201,1,0
diff --git a/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/NestedContainer.csv b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/NestedContainer.csv
new file mode 100644
index 00000000..f20f888b
--- /dev/null
+++ b/Tests/Functional/Datahandler/DefaultLanguage/Fixtures/ContainerWithChildrenInCmdmap/NestedContainer.csv
@@ -0,0 +1,9 @@
+"pages"
+,"uid","pid","title"
+,1,0,"page-1"
+,3,0,"page-2"
+"tt_content"
+,"uid","pid","CType","header","sorting","sys_language_uid","colPos","tx_container_parent","l18n_parent"
+,1,1,"b13-2cols-with-header-container","container",64,0,0,0,0
+,2,1,"b13-2cols-with-header-container","child-container",128,0,200,1,0
+,3,1,"header","content-in-child-container",192,0,200,2,0
diff --git a/Tests/Functional/Datahandler/Workspace/ContainerTest.php b/Tests/Functional/Datahandler/Workspace/ContainerTest.php
index 70f11db9..6ed4426a 100644
--- a/Tests/Functional/Datahandler/Workspace/ContainerTest.php
+++ b/Tests/Functional/Datahandler/Workspace/ContainerTest.php
@@ -314,4 +314,20 @@ public function deleteContainerWithChildHasDeletedPlaceholderInWorkspaceDoNotDis
         $this->dataHandler->process_cmdmap();
         self::assertCSVDataSet(__DIR__ . '/Fixtures/DeleteContainerWithChildHasDeletedPlaceholderInWorkspaceDoNotDiscardThisChildResult.csv');
     }
+
+    #[Test]
+    public function copyContainerWithChildrenInCmdmapCopiesChildMovedOutOfContainerInWorkspace(): void
+    {
+        $this->importCSVDataSet(__DIR__ . '/Fixtures/CopyContainerWithChildrenInCmdmapChildMovedOutOfContainer.csv');
+        $cmdmap = [
+            'tt_content' => [
+                3 => ['copy' => 3],
+                2 => ['copy' => 3],
+                1 => ['copy' => 3],
+            ],
+        ];
+        $this->dataHandler->start([], $cmdmap, $this->backendUser);
+        $this->dataHandler->process_cmdmap();
+        self::assertCSVDataSet(__DIR__ . '/Fixtures/CopyContainerWithChildrenInCmdmapChildMovedOutOfContainerResult.csv');
+    }
 }
diff --git a/Tests/Functional/Datahandler/Workspace/Fixtures/CopyContainerWithChildrenInCmdmapChildMovedOutOfContainer.csv b/Tests/Functional/Datahandler/Workspace/Fixtures/CopyContainerWithChildrenInCmdmapChildMovedOutOfContainer.csv
new file mode 100644
index 00000000..2650fab4
--- /dev/null
+++ b/Tests/Functional/Datahandler/Workspace/Fixtures/CopyContainerWithChildrenInCmdmapChildMovedOutOfContainer.csv
@@ -0,0 +1,6 @@
+"tt_content"
+,"uid","pid","CType","header","sorting","sys_language_uid","colPos","tx_container_parent","l18n_parent","l10n_source","t3ver_oid","t3ver_wsid","t3ver_state","t3ver_stage"
+,1,1,"b13-2cols-with-header-container","container",128,0,0,0,0,0,0,0,0,0
+,2,1,"header","moved-out-in-workspace",256,0,200,1,0,0,0,0,0,0
+,3,1,"header","child",512,0,201,1,0,0,0,0,0,0
+,4,1,"header","moved-out-in-workspace",1024,0,0,0,0,0,2,1,4,0
diff --git a/Tests/Functional/Datahandler/Workspace/Fixtures/CopyContainerWithChildrenInCmdmapChildMovedOutOfContainerResult.csv b/Tests/Functional/Datahandler/Workspace/Fixtures/CopyContainerWithChildrenInCmdmapChildMovedOutOfContainerResult.csv
new file mode 100644
index 00000000..3b9d841b
--- /dev/null
+++ b/Tests/Functional/Datahandler/Workspace/Fixtures/CopyContainerWithChildrenInCmdmapChildMovedOutOfContainerResult.csv
@@ -0,0 +1,9 @@
+"tt_content"
+,"uid","pid","CType","header","sorting","sys_language_uid","colPos","tx_container_parent","l18n_parent","l10n_source","t3ver_oid","t3ver_wsid","t3ver_state","t3ver_stage"
+,1,1,"b13-2cols-with-header-container","container",128,0,0,0,0,0,0,0,0,0
+,2,1,"header","moved-out-in-workspace",256,0,200,1,0,0,0,0,0,0
+,3,1,"header","child",512,0,201,1,0,0,0,0,0,0
+,4,1,"header","moved-out-in-workspace",1024,0,0,0,0,0,2,1,4,0
+,5,3,"header","moved-out-in-workspace",256,0,0,0,0,0,0,1,1,0
+,6,3,"b13-2cols-with-header-container","container",128,0,0,0,0,0,0,1,1,0
+,7,3,"header","child",192,0,201,6,0,0,0,1,1,0