I cannot modify the transaction day of several journal entries; I have the error -30006 and cannotspecify the correct transaction dates.

Let's rectify the error you've encountered upon changing transaction dates on journal entry (JE), stephan.

To start, let's access your company file using a private window. This way, we can determine if the error is caused by browser-related issues. You can use the following shortcuts to access them:

• Google Chrome: press Ctrl + Shift + N
• Mozilla Firefox: press Ctrl + Shift + P
• Safari: press Command + Shift + N

After changing the transaction dates, we can clear your browser's cache or cookies to avoid similar issues in the future. Alternatively, opting for one of the supported browsers can be an alternative.

However, if you still prefer to speak with one of our Technical Support, you can follow the steps below to initiate a chat or get a call back from them:

1. Go to this website: https://quickbooks.intuit.com/learn-support/en-global/contact.
2. Select QuickBooks Online in the product section.
3. Type your concerns in the designated section, and click Continue to proceed.
4. From the options, select either Chat with us to start a conversation or Receive a Callback to get a spot in line and call you back.

Let me know if you have further concerns about managing transactions or any QuickBooks-related matters. The Community always has your back. Stay safe!