Noncorrect export to PDF

Hi dear friends,

I´ve exported the sheet "2_rezy100" from attached DWG file to PDF. The size of sheet is A0 (CFG have I attached, too). In the preview of drawing the all looks OK, the normal print to paper is OK, too. But the drawing is  smaller on PDF and it isn´t in the whole area of the sheet.  If I measure dimensions in the PDF Reader so they´re smaller, too. Exported drawing isn´t in the correct scale. The size of paper was set correct in the dialog during export.

Thank you very much for identification of the problem.