SI messages sent when excuting ROLLBACK PREPARED command

Hi

When reading the code FinishPreparedTransaction, I found that SI messages are sent 
when executing ROLLBACK PREPARED command.

But according to AtEOXact_Inval function, we send the SI messages only when committing the transaction .

So, I think we needn't send SI messags when rollbacking the two-phase transaction.
Or Does it has something special because of two-phase transaction?


Regards