diff --git a/Block/Adminhtml/DunningBlockButton.php b/Block/Adminhtml/DunningBlockButton.php
new file mode 100644
index 0000000..cab7579
--- /dev/null
+++ b/Block/Adminhtml/DunningBlockButton.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Ibertrand\BankSync\Block\Adminhtml;
+
+use Magento\Backend\Block\Widget\Container;
+use Magento\Backend\Block\Widget\Context;
+use Magento\Framework\Registry;
+use Magento\Sales\Model\EntityInterface;
+use Magento\Sales\Model\Order\Invoice;
+
+class DunningBlockButton extends Container
+{
+    /**
+     * Core registry
+     *
+     * @var Registry
+     */
+    protected Registry $coreRegistry;
+
+    /**
+     * @param Context  $context
+     * @param Registry $registry
+     * @param array    $data
+     */
+    public function __construct(
+        Context  $context,
+        Registry $registry,
+        array    $data = [],
+    ) {
+        $this->coreRegistry = $registry;
+        parent::__construct($context, $data);
+    }
+
+    protected function _construct()
+    {
+        $this->addButton(
+            'banksync_block_dunning_button',
+            [
+                'label' => $this->getLabel(),
+                'class' => 'dunning_block',
+                'onclick' => "setLocation('{$this->getTargetUrl()}')",
+            ]
+        );
+
+        parent::_construct();
+    }
+
+    /**
+     * @return string
+     */
+    protected function getLabel(): string
+    {
+        return __(
+            $this->invoiceIsBlocked() ? 'Remove dunning block' : 'Dunning block'
+        );
+    }
+
+    /**
+     * @return bool
+     */
+    protected function invoiceIsBlocked(): bool
+    {
+        return !empty($this->getInvoice()->getBanksyncDunningBlockedAt());
+    }
+
+    /**
+     * @return Invoice
+     */
+    protected function getInvoice(): EntityInterface
+    {
+        return $this->coreRegistry->registry('current_invoice');
+    }
+
+    /**
+     * @return string
+     */
+    protected function getTargetUrl(): string
+    {
+        $setBlocked = $this->invoiceIsBlocked() ? 0 : 1;
+        return $this->getUrl("banksync/dunning/block", ['invoice_id' => $this->getInvoiceId(), 'set_blocked' => $setBlocked]);
+    }
+
+    /**
+     * @return integer
+     */
+    protected function getInvoiceId(): int
+    {
+        return $this->getInvoice()->getId();
+    }
+}
diff --git a/Controller/Adminhtml/Dunning/Block.php b/Controller/Adminhtml/Dunning/Block.php
new file mode 100644
index 0000000..6d4bdc3
--- /dev/null
+++ b/Controller/Adminhtml/Dunning/Block.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Ibertrand\BankSync\Controller\Adminhtml\Dunning;
+
+use Ibertrand\BankSync\Logger\Logger;
+use Magento\Backend\App\Action;
+use Magento\Backend\App\Action\Context;
+use Magento\Framework\Controller\Result\Redirect;
+use Magento\Framework\Controller\ResultFactory;
+use Magento\Framework\Exception\InputException;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Sales\Model\Order\InvoiceRepository;
+
+class Block extends Action
+{
+    const ADMIN_RESOURCE = 'Ibertrand_BankSync::sub_menu_dunnings';
+    private InvoiceRepository $invoiceRepository;
+    private Logger $logger;
+
+    /**
+     * @param Context           $context
+     * @param InvoiceRepository $invoiceRepository
+     * @param Logger            $logger
+     */
+    public function __construct(Context $context, InvoiceRepository $invoiceRepository, Logger $logger)
+    {
+        parent::__construct($context);
+        $this->invoiceRepository = $invoiceRepository;
+        $this->logger = $logger;
+    }
+
+    /**
+     * @return Redirect
+     * @throws NoSuchEntityException
+     * @throws InputException
+     */
+    public function execute()
+    {
+        $invoiceId = $this->getRequest()->getParam('invoice_id');
+        $setBlocked = !empty($this->getRequest()->getParam('set_blocked'));
+
+        $invoice = $this->invoiceRepository->get($invoiceId);
+        if ($setBlocked) {
+            $this->logger->info('Invoice ' . $invoice->getIncrementId() . ' blocked for dunning');
+            $invoice->setBanksyncDunningBlockedAt(date('Y-m-d H:i:s'));
+        } else {
+            $this->logger->info('Invoice ' . $invoice->getIncrementId() . ' unblocked for dunning');
+            $invoice->setBanksyncDunningBlockedAt(null);
+        }
+        $this->invoiceRepository->save($invoice);
+
+        $redirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
+        $redirect->setPath('sales/invoice/view', ['invoice_id' => $invoiceId]);
+
+        return $redirect;
+    }
+}
diff --git a/Helper/Dunning.php b/Helper/Dunning.php
index 5fdfbe7..705ea0d 100644
--- a/Helper/Dunning.php
+++ b/Helper/Dunning.php
@@ -280,7 +280,8 @@ public function getOpenInvoices(int $storeId): InvoiceCollection
             ->addFieldToFilter('main_table.created_at', ['gt' => $minCreationDate])
             ->addFieldToFilter('main_table.created_at', ['lt' => $latestCreationDate])
             ->addFieldToFilter('main_table.store_id', $storeId)
-            ->addFieldToFilter('is_banksynced', ['eq' => 0]);
+            ->addFieldToFilter('is_banksynced', ['eq' => 0])
+            ->addFieldToFilter('banksync_dunning_blocked_at', ['null' => true]);
 
         $paymentMethods = $this->config->getPaymentMethods();
         if (!empty($paymentMethods)) {
diff --git a/etc/db_schema.xml b/etc/db_schema.xml
index 40e8e4e..c765f43 100644
--- a/etc/db_schema.xml
+++ b/etc/db_schema.xml
@@ -109,4 +109,7 @@
             <column name="entity_id"/>
         </constraint>
     </table>
+    <table name="sales_invoice">
+        <column xsi:type="datetime" name="banksync_dunning_blocked_at" nullable="true" comment="Block dunnings"/>
+    </table>
 </schema>
diff --git a/etc/db_schema_whitelist.json b/etc/db_schema_whitelist.json
index d8ae67d..6e4790d 100644
--- a/etc/db_schema_whitelist.json
+++ b/etc/db_schema_whitelist.json
@@ -104,5 +104,10 @@
         "constraint": {
             "PRIMARY": true
         }
+    },
+    "sales_invoice": {
+        "column": {
+            "banksync_dunning_blocked_at": true
+        }
     }
 }
\ No newline at end of file
diff --git a/etc/module.xml b/etc/module.xml
index 380fc89..62bddb9 100644
--- a/etc/module.xml
+++ b/etc/module.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
-    <module name="Ibertrand_BankSync" setup_version="0.0.20">
+    <module name="Ibertrand_BankSync" setup_version="0.0.21">
     </module>
 </config>
diff --git a/i18n/de_DE.csv b/i18n/de_DE.csv
index 3b0b9b9..e4f9024 100644
--- a/i18n/de_DE.csv
+++ b/i18n/de_DE.csv
@@ -161,3 +161,5 @@ Archive transaction,Transaktion archivieren
 "Archive ""%1""","""%1"" archivieren"
 Transaction archived.,Transaktion archiviert.
 Transaction archived,Transaktion archiviert
+Dunning block,Mahnsperre
+Remove dunning block,Mahnsperre aufheben
\ No newline at end of file
diff --git a/view/adminhtml/layout/sales_order_invoice_view.xml b/view/adminhtml/layout/sales_order_invoice_view.xml
new file mode 100644
index 0000000..930cfa2
--- /dev/null
+++ b/view/adminhtml/layout/sales_order_invoice_view.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
+    <body>
+        <referenceBlock name="page.actions.toolbar">
+            <block class="Ibertrand\BankSync\Block\Adminhtml\DunningBlockButton" as="banksync_block_dunning_button"/>
+        </referenceBlock>
+    </body>
+</page>