Just after this post, I tried with SETCURRENTKEY in place of GET and its working fine.
Now the issue is Report is not getting updated with respect to Quote no. and sales Line No.
I tried with few option but not able to resolve...can anyone suggest.
My code
SalesHeader.SETCURRENTKEY("Document Type");
SalesHeader.SETRANGE("Document Type",SalesHeader."Document Type"::Quote);
QuoteReport.SETTABLEVIEW(SalesHeader);
SalesHeader.SETRECFILTER;
QuoteReport.SAVEASPDF('D:\temp\' + '.pdf');
Thank you