Take a look at the following:
I was curious about that, I didn’t really understand what is going on here, so I tracked it down a bit…
Skipping over the part where there is a cast of null, this seems to indicate that this is a call to modify the entity to simulate concurrency, digging deeper:
Seems like I was right, it is intended to force the save of this item to the database. That seemed very strange, so I checked upward, where this is used, and I found:
So, ChangeBankAccount is just another way of saying Save(), it seems, in a very round about way.