Back Order / Sales Order / Invoice

I have a sales order that needs to be invoiced. We are trying to remove one of the finished goods off of the Sales Order but get the following message:

We need to invoice the customer, and want to invoice the correct amounts.

The line is already in a status when you can’t simply remove it without additional actions. Details depends on what status it is. For example, you may need to unpick the item.

Invoice based upon the shipment parameter not all - depending if the error line is actually shipped. As Martin says the order line you are trying to remove is in process. However you could set the ship now and invoice based upon ship now quantities as well (I think)