rdlc report nav 2015

I have declared TotBonusClasses as a new virtual table where it calls values and adds them to my report
and a code
IF "Posted Settlement Add./Ded.".Code IN THEN
BEGIN
TotBonusClasses:=TotBonusClasses + Amount;
CurrReport.SKIP;
END;

IF "Posted Settlement Add./Ded.".Code IN THEN
BEGIN
TotBonusClasses2:=TotBonusClasses2 + Amount;
CurrReport.SKIP;
END;

but when call in this in report does the calculation correctly in the first page but on other reports keeps summing the data as it grows please help