If you create a negative sales order or a return order without specifying the batch number on sales line level since you want to specify the batch in the registration screen, you get an error when selecting an expired batch in the registration screen. If you enter on the sales order the batch number (only possible if we have 1 batch, otherwise we have to add for each batch returned a sales order line), and we do not click on the drop down of the batch in the registration screen, we can Confirm the registration. If we can post a registration for an expired batch (and this must stay absolutly possible to handle returns), it must also be possible to select the expired batch in the registration screen so we don't have to specify them during order line creation.