Hi there, @jaapkrijger.
I appreciate you for going through the steps provided above. Please know this is not what we want you to experience with QuickBooks.
I want to help you sort this out. Let me route you to the right support team. They have available resources and tools to take a look into your account and can do a screen-share with you. That way, they can assist you right away with this.
Here's how to contact them:
- Go to? Help at the top right.
- Click Contact Us.
- Enter " can't merge inventory items " as your concern.
- Click Let's talk.
- Choose the best support option for you.
Also, you can refer to this article for the different types of support we offer at Intuit and its availability: Support hours and types.
Feel free to check this helpful article for reference in case you want to learn how to setup advanced inventory in QuickBooks Desktop.
If you have other concerns or questions, please feel free to leave a comment below. I'm always here to help.
