Yes, when there're been an aircraft switch, from sh767 to lh767.

Got my BP on my BB for my preassigned seat 1D.

In the morning, just before the flight, checked MMB and OLCI from my pc and it now showed me in 1E, which means lh767. Don't like the rearfacing row 1 seat, and was able to go back into the seatmap on the pc and switch to 1F, best seat in the cabin.

So, if there is an aircraft switch, it may assign you a new seat, and then you can even change seats, as it doesn't recognise the "BP printed" command.