No to derail this discussion thread any further but importing single tables is not supported by SAP, it is only a matter of time until something breaks. I think you should revisit your procedures.
Anyway, I don't have much to contribute to this discussion thread. If you exported the PSEs and you are now trying to import the PSEs, you are prompted for the credentials assuming credentials are not in place. As mentioned by Rishi Abrol see SAP note 152505 and the referenced SAP note 800240 for details.