I've come across some unexpected behavior when using bo.Save(true) (i.e. BO-level saving, not form-level saving)

If I have a simple saving method as follows:

void SaveProject() {
    BusinessLayer.TransactionBegin("", IsolationLevel.ReadCommitted);
    SaveUndoResult result = bo.Save(true);
    if (result == SaveUndoResult.Success) {
        BusinessLayer.TransactionCommit("");
    }
    else {
        BusinessLayer.TransactionRollback("");
    }
}

Let's suppose I call SaveProject(), but the bo fails its CheckRules.  Therefore, the save operation fails and the transaction is rolled-back, as expected.  However, the internal value of bo._IsSavedOnTransaction is set to true by bo.Save function, even though the rules checked fail. (Note: the call to BusinessLayer.TransactionRollback does not reset the value bo._IsSavedOnTransaction to false.)

Now, if I fix the cause of the rule failure and call ProjectSave() a second time, nothing happens Why? Because the value bo._IsSavedOnTransaction is true from the first call, and bo.IsDirty (called in the bo.Save() routine) returns false.  Therefore, no save is attempted.

I don't know if this is a bug or a feature.  At least, it's unexpected behavior.