If you change the standard cost for a an item with a periodic valuation method that is used on a saved SOP dropship invoice and post the transaction in a batch, the warning below does not occur. “The Unit cost on drop-ship items must match the invoice’s current standard cost. Choose Yes to update the unit cost and post the invoice. Choose No if you do not want to post the invoice”. This causes the distributions to be incorrect (the cogs account will offset the difference in amount instead of it being added to the IV account causing the accounts to have incorrect amounts). The journal entry is still in balance and will post without issue which makes it hard to track down after the issue has occurred.