Pushback a GL journal using the Approval Framework approval workflow.

Actually, I have 2 questions on GL workflow. We are on 9.2, PUM 7.

1)  I have not changed the delivered Transaction Registry nor the delivered Transaction Configuration.  When I try to pushback a journal, I am getting the message that this journal cannot be pushed back.  I get the same message whether I try to push back from the WorkCenter or the Manage Journal Approvals page.  If I use the Journal Entry approval page, there is not even an option to Push Back.  What am I missing?

2) I cannot add Adhoc approvers to journal entries.  How is this configured?

Thanks in advance,