How is the error message 'Serial number missing' in my account under the category 'Products' resolved?

For customers, if you encounter the error message "serial number missing" in the "My products" section of your account, please upload the serial number by clicking on the button "Add serial number/invoice" next to the affected product.

Should this not be possible and the error message keeps showing up, please reach out to the Sales Order Management Team for further information and help on this matter.