I think you need to start drilling down on the unexpected amounts to figure out from where the questionable amounts originate. If you can chase the amounts all the way to base level, you can determine if the cell came from Stage, Journal, Form, Calculation or what have you. As alluded by a couple of the other responses, a YTD reversal is a common cause. If it's a derived OS reversal, it will usually show up in grey in OS Cube Views, but it can be "derived" through prior means too. I've seen all sorts of issues that can present like this when loading/saving/computing YTD data into Periodic storage or Periodic data into YTD storage. YTD to Periodic storage is the most problematic, especially if you attempt to zero suppress the source YTD data.