The Price Adjustments section of the Account Statement will reflect any price adjustments that were made to your account based on actual execution or closing prices of your futures.
One case where this would be used is on futures transactions where the difference in the trade price and the closing price multiplied by the quantity and multiplier will be reflected in column MTM P/L within the Trade section of the statement. In the event this information is missing, the change will generally be reflected in the Price Adjustment section.
For additional information on Account Statements, please refer to the online Reporting Reference Guide.