When I use checkmytrip the e-ticket starts 236- as it was through BD and not the 618 which SQ requires.
I had already checked there and found nothing I can use.
I know that on the outbound leg I can use LH to check in, as they are the airline for the first leg. On the return we can check in at the SQ Airline desks, but I would rather do so online.
I have sent an email to their reservations department but guess that they will want me to phone them.