diff --git a/changelog/58_UNRELEASED_2020-xx-xx.md b/changelog/58_UNRELEASED_2020-xx-xx.md
index 9b7fe375..ae4b3779 100644
--- a/changelog/58_UNRELEASED_2020-xx-xx.md
+++ b/changelog/58_UNRELEASED_2020-xx-xx.md
@@ -17,6 +17,7 @@
 - Fixed that "Default best before days" and "Default best before days after opened" on the product edit page were always shown regardless of the feature flags `FEATURE_FLAG_STOCK_BEST_BEFORE_DATE_TRACKING` and `FEATURE_FLAG_STOCK_PRODUCT_OPENED_TRACKING`
 - Fixed that the form validation limits for the amount input and products with enabled tare weight handling were wrong
 - Fixed that the price was saved wrong for products with a different purchase/stock quantity unit when using "Total price" on purchase (resulted for example in wrong recipe costs)
+- Fixed that undoing "product-opened"-actions was not possible
 
 ### Shopping list fixes
 - Fixed that the "shopping list to stock workflow"-dialog was not visible in compact view
diff --git a/services/StockService.php b/services/StockService.php
index d19e578b..273b790c 100644
--- a/services/StockService.php
+++ b/services/StockService.php
@@ -724,7 +724,7 @@ class StockService extends BaseService
 		return null;
 	}
 
-	public function OpenProduct(int $productId, float $amount, $specificStockEntryId = 'default')
+	public function OpenProduct(int $productId, float $amount, $specificStockEntryId = 'default', &$transactionId = null)
 	{
 		if (!$this->ProductExists($productId))
 		{
@@ -745,6 +745,11 @@ class StockService extends BaseService
 			$potentialStockEntries = FindAllObjectsInArrayByPropertyValue($potentialStockEntries, 'stock_id', $specificStockEntryId);
 		}
 
+		if ($transactionId === null)
+		{
+			$transactionId = uniqid();
+		}
+
 		foreach ($potentialStockEntries as $stockEntry)
 		{
 			if ($amount == 0)
@@ -768,7 +773,8 @@ class StockService extends BaseService
 					'stock_id' => $stockEntry->stock_id,
 					'transaction_type' => self::TRANSACTION_TYPE_PRODUCT_OPENED,
 					'price' => $stockEntry->price,
-					'opened_date' => date('Y-m-d')
+					'opened_date' => date('Y-m-d'),
+					'transaction_id' => $transactionId
 				));
 				$logRow->save();
 
@@ -802,7 +808,8 @@ class StockService extends BaseService
 					'stock_id' => $stockEntry->stock_id,
 					'transaction_type' => self::TRANSACTION_TYPE_PRODUCT_OPENED,
 					'price' => $stockEntry->price,
-					'opened_date' => date('Y-m-d')
+					'opened_date' => date('Y-m-d'),
+					'transaction_id' => $transactionId
 				));
 				$logRow->save();