Adding a duplicate tracking number

[ljluck]

HI everyone, please help!

I just had a buyer buy two of my items.  Same listing just different variables.  For some reason, I didn't get the option to combine the invoice.  Anyway, I did ship everything together and printed a shipping label for the first order, thinking I could copy that shipping number to the 2nd order.  However, I was wrong, eBay will not let me copy in the tracking number because they are saying its being used for another order.  

The items are going to the same buyer at the same address.  Is there a way to add the tracker number I already have to the 2nd order so I get my tracking upload credit?

Thanks, Jon