Why not try to get the MPC# added as the FQTS and BAEC# as FQTV?
FQTV - frequent flyer account that the miles should be credited to.
FQTS - frequent flyer account denoting which status benefits to use.
FQTR - frequent flyer account that provided miles for a redemption (can be different to that of the Pax flying).
FQTU - frequent flyer account that provided miles for an upgrade.