Write-off of overseas investment permitted subject to RBI-approved export realisation threshold; excess requires RBI permission. Regulation 17 permits a listed Indian party to write-off a shortfall between invested value and sale price in an overseas JV or WOS if the difference does not exceed the percentage of its prior year export realisation approved by the Reserve Bank; where the shortfall exceeds that approved percentage, the Indian party must seek Reserve Bank permission to write-off the capital, which may be granted subject to conditions.