"Engie has accordingly exercised its rights to require Toshiba to buy its holding." Toshiba has previously warned it was facing a writedown exceeding 700 billion yen at Westinghouse. Its shares have lost more than half their market value since late December, when Toshiba warned of the flood of red ink at Westinghouse and said it was investigating claims of possible accounting errors by senior executives at the division. Toshiba said the transaction would have no impact on its consolidated accounts. It fears a loss of 1.01 billion yen in the fiscal year which ended in March.