Or link the two (KrisFlyer and M&M) numbers by including your M&M FFN in your KrisFlyer profile, and only use the M&M card at purchase and checkin. This lazy man's way has worked for me so far.
This process can only be done (I think) by an SQ reservation agent, or check in staff.
Ask them to enter your LH M&M number in the "FQTV field" - those exact words. You will earn M&M miles on this side
Ask them to enter your KF number in the "FQTS field" - this is merely for PPS Value and/or status recognition. You will not earn KF elite miles nor KF miles.
This obviously has very little effect if you're on an award or travelling in Y, AND if your M&M status is higher than your KF status.
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