how do you calculate Month-to-date unrealized and realized P&L/performance? What is the cost basis for both? Should the cost be reset based on the end-of-previous month mark to market or the original cost?Is it the original cost for the realized p&l and the eom mtm of the previous month for the unrealized? Is there an official document? I'm currently having an argument with our accounting dept due to use of inconsistent cost basis. Any help is greatly appreciated.