(Reuters) – Former American International Group Inc Chief Executive Maurice “Hank” Greenberg said New York's attorney general should be barred from invoking a 91-year-old state law in a fraud case over two suspect reinsurance transactions.

Greenberg and co-defendant Howard Smith, AIG's former chief financial officer, sought permission on Monday to appeal to the state's highest court, the Court of Appeals, a May 8 appellate ruling letting Attorney General Eric Schneiderman pursue civil fraud claims against them under the state's Martin Act.

That ruling by the Manhattan appeals court cleared the way for the 7-year-old case to go to trial.

Investigators claim a transaction with General Re Corp, a unit of Warren Buffett's Berkshire HathawayInc , helped AIG inflate loss reserves by $500 million without transferring risk, while a transaction with Capco Reinsurance Co helped AIG hide more $200 million of losses. Both transactions took place more than a decade ago.

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