If anyone knows the answer to this it would be the KLM GSA in Colombo:
Carsons Airline Svcs Pvt. Ltd,
No. 65C Dharmapala Mawatha,
6th floor, Equity Building
Colombo 7
Sri Lanka
Phone: +9411 2439747
Fax: +9411 2439766
Office Hours: 0830-1700 hrs (Mon-Fri)
(Lunch 1230-1330 hrs)
0830-1230 hrs (Sat)
I have worked with Dushanthi in the Carsons office on many tickets and she has generally done a good job with these. A quick call should get you the answer... BTW, the ex-CMB "C" fares to the US that you can book thru Carsons are the absolute best in the region, PM me if you want complete details.