Why can I not update the 'Sold by' user in the Commissions tab?

If you are trying to update who sold a specific item within an order and a little error symbol pops up, you are seeing this because the order has already been checked out!

Once an order has been checked out, no edits can be made and this includes editing the commission on the order.

If you want to change the commission you MUST do this before the order is checked out!