Post Script files problem after Export.

Hello, I have a problem with Post Script files in Corel Draw 5. I export file as .ps for ready to print. But when I export PS file back in Corel, this quote appears: ''The PostScript level of Corel document is higher than the PostScript level of this device. Change the PS Level in the Corel application by selecting the PostScript tab in the print dialog, and selecting document level from the Compatibility drop down list.''   instead of curves or file itself. Please, Im cueless, Do you know, how to fix it? Thank you very much :)