Traders wary of Fannie Maes mortgage math.

[bartongrl1]

WASHINGTON - Fannie Mae's bookkeeping is drawing scrutiny from Wall Street — again.

Three years after a stunning accounting scandal that forced it to restate earnings by $6.3 billion, the giant government-sponsored company that buys and sells home loans is on the defensive over a change in how it calculates potential losses from the growing mortgage crisis.

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