eBay Errors: 515 – The quantity must be a valid number greater than 0.

You have to check if “Out of stock” is active on your eBay profile. 

How to use the out-of-stock option for Good 'Til Cancelled listings

If you've set your listing duration to Good 'Til Cancelled, the listing will show up to buyers until you've sold all your items. When that happens, the listing will end.

However, if you regularly get more stock of that item, then you can use our out-of-stock option. Your listing will then be hidden from search results, but as soon as you increase the quantity again, the listing will reappear in searches.

Here's how to enable the out-of-stock option:

Go to Site preferences in My eBay
Select Show next to Sell Your Item form and listings.
Tick Yes next to Use the out-of-stock option.
Select Apply.

eBay: Return Policy Attribute RefundOption Not Valid On This Site error

Go to eBay Business Policies



Click Edit next to your Return policy
Remove any text in "Policy description"



Click "Save"
Repeat for each return policy.
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