QR: printed text smaller after saving to QRP file

When I I print a report using

imprfact1frm.qrfacture.Print

it works fine.

But I when I save the report to QRP file with

imprfact1frm.qrfacture.Prepare;
imprfact1frm.qrfacture.QRPrinter.save(xfile.QRP');

and load it again with

imprfact1frm.qrfacture.Prepare;
imprfact1frm.qrfacture.QRPrinter.load(xfile.QRP');
imprfact1frm.qrfacture.QRPRINTER.print;

the printed result is smaller from about 80% than the original
I have tried the zoom property but it works only with preview not with the
print command.

any idea

thanks

Thierry Collaud