Not a major issue as I rarely use this feature, but I notice Back Order doesn't seem to be working with products that have options when using Alt IDs.

For a product using Alt IDs with options 'Back Order' is not displayed, only 'Add To Cart' which then attempts to add 0 to the cart with an error message.

I'm using the most recent 7.2.3
I've tried this on a site that doesn't use Alt IDs with options and it seems to work correctly.

Thanks,

Steve