Hi maryle,
Thanks for posting your question here. If you revise an item on eBay, you do *not* have to revise the same item again within Auctiva to ensure the revision is maintained when the item is relisted. When a GTC listing is automatically relisted at the end of each 30 day period, no information is pulled from within your Auctiva account.
However, when a revision is made through eBay, the saved listing within your Auctiva account from which you posted the item would not automatically be updated to reflect that revision. Therefore, if you were to reuse those saved listings to post new instances of the same items in the future, you would need to make those revisions through Auctiva at that time.
I hope this clears things up. If you need any further assistance with this, please feel free to contact our customer support team by mousing over the "Help" tab within your account and selecting the "File Support Case" option.
-Mike