An accounting rule proposed for derivatives could  destroy many tools financial institutions use to manage market risk, a   coalition of banking and securities groups warned.   
The Financial Accounting Standards Board's proposal, which was released  in April, would require companies to value derivatives and other hedged   instruments at their market value, rather than acquisition price.   
  
The accounting board has said the change would not distort a company's  balance sheet because the firm would mark to market both the derivative and   the instrument hedging it. The two actions should cancel each other out,   according to the board.     
But the trade group coalition said Tuesday that accounting techniques  needed to balance the derivative with its hedge are too expensive and too   complex for most institutions. Some might have to stop using hedges   altogether to reduce their risk exposure, the groups said.     
  
"The ability of companies to manage risk must not be impaired," a letter  signed by coalition members stated. "We urge FASB to reconsider its plans   to finalize its newly developed approach, and we urge the (Securities and   Exchange Commission) to exercise restraint so that the FASB is not pressed   to issue rules until a more effective approach is found."       
The coalition includes the American Bankers Association, the ABA  Securities Association, the Bankers Roundtable, the International Swaps and   Derivatives Association, the Securities Industry Association, and the New   York Clearing House Association.