Complete error description: ” Listing cannot be revised, need help?” “portions of this listing cannot be revised if the item has bid or active Best Offers or is ending in 12 hours.”
Cause
If you have some bids on your listing, a customer has it in the cart, or the insertion is close to ending, you cannot edit the listing.
Another common cause of this error is when someone attempts (accidentally or intentionally) to disable the best offer on an item.