Importing and Exporting xer's and xls in Primavera 7.0

 When exporting xer's or xls' our actual dates are not holding and reverting to the data date. Also, our notebook information that we place is not exporting out to xls.  When importing xer's or xls we have our project filtered down to the specific contractor or subcontractor and it is pulling the information in but wiping out all of the other updated information from the other contractor or subcontractors.  Thank you.