Hi Raj,
if i'm not wrong you don't want cancel invoices in your report if this is your query the do following changes .
* in your select query add " RFBSK " field and put condition where RFBSK ne 'C'. Like as shown below.
SELECT SINGLE kunrg vbeln fkdat fkart RFBSK FROM vbrk INTO CORRESPONDING FIELDS OF it_add
WHERE vbeln = vbeln and RFBSK NE 'C'.