I just recently flew from MUC-FRA on LH, followed by a FRA-ORD flight on UA - I originally had my UA Mileage Plus number on those flights from when I booked it long ago, but changed both flights to my CO OnePass number when I checked in at Munich (the CO *G status shows on both boarding passes).

However, I checked today and it looks like while the MUC-FRA flight did get credited to my OP account, the FRA-ORD flight got credited to my MP account. Is there any way to switch the crediting of that second flight from Mileage Plus to OnePass? I thought that since both boarding passes showed CO *G, I would have been all set.