Importing VCSA 5.5 into vCD catalog fails with error Duplicate element ‘AnnotationSection’
To get around this error you need to edit the OVF file.
Disclaimer: I’m pretty sure that manually editing the OVF is not supported by VMware!
I had a VCSA ova so i first extracted the OVF using 7zip. Once extracted open the .ovf file in a text editor and look for the AnnotationSection
Highlight the section and delete it. Save the file. Because the manifest file is a checksum validation will fail so the quickest solution is to delete the .mf manifest file.
The OVF should then import to vCD successfully!