Hello.
As stated on the Messages Guide document, code E03020706 corresponds to:
The selected item has no version in the repository Base view.
Reason: The attempt to update or move an item failed because the item does not have a version in the repository view.
Action: None. The item must exist in the repository view.
It looks like you should check the root version/item that you want to move.
Also, you should provide more details, like the steps executed to reach that error and your system characteristics, so the community can help you.
If you still have that problem, you should open a case on the Support Site, as this looks like something specific to your context.
Best regards,
Ricardo Bernardino