Post previous year parked invoices (MIRO), but system regenerate new doc

Dear all,

I am trying to post previous year 2011 parked invoice document from MIRO. I changed the posting date and document date to this year 2011. When i click 'Post', i receive system message indicate that the previous parked document number was deleted and system regenerate a new number.

Please advice whether any settings can be done to avoid this deletion of previous parked document number. I have numerous parked document to be posted. If this cannot be done, there will be a number of deleted documents.

Thanks