Quote from Swan Noir:
What you describe is at the heart of the audit process ... at least by US GAAP standards. Auditors do not prepare your books but they do spot check with outside sources (banks, brokers etc.) that what you have represented is indeed accurate.
Do you know if it's also standard procedure to calculate the PnL and detail the trading activity for EACH security or a global PnL is enough, or at least a global PnL for each market concerned ?