dont forget to verify the table as well, as I was pulling my hair out with this, as I could see the updated data when ever I replsced the data with a new selection.

oCrystal=CreateObject('Crystal.CRPE.Application')
oReport=oCrystal.OpenReport('report1 .rpt')
oReport.database.Verify

and if you want to preview
oReport.Preview

or to print with out user intervenstion
oReport.Printout(.F.)