Mapping error due to structure

My scenario fails during mpping. File icked by FTP server..

It's file to proxy

My inbund structure in PI is like this

InboundBillingConfirmaton

     Header

          Field 1

          Fied 2

     Items unbounded

             Field 3

               Field 4

Hwever the file that client kept in ftp flder is like this

AccoutsDetails

     Header

          Feld 1

          Field 2

     Items

          Field 3

          Field 4

<AccountDetails>

How do I take care of the AccountsDetails tag which is not there in my structure?

Secondly,

My target structure is

<table>

Field 1

Field 2

Field 3

Field 4

Al four fields come under Table node.

Should I map Items to Table. Item can come unbounded times? Table should also come unbunded times.