If you are seeing the message 'Revise failed : Type should contain only one value. Remove the extra values and try again'.
The error above is coming directly from eBay. This error message means that your template contains text that is not permitted as per eBay policy.
It’s best not to use the '+' symbol in the attribute value of the "Item Details" section. If you need to use it, please use two together like this '++', otherwise all attribute using single '+' will cause this error.
You will need to fix this in eBay, once you have done so you will be able to revise items again from within the Swift Dashboard.
If you still have issues then please contact eBay support.