SSRS summation

Hi,

I ve a Tablix. with  serialno,amourcur,invoiceno columns. I applied filters like serial no > 13 it will show the rows other wise it will hide the rows. It is showing morethan 13 records. but  When added Sum(Fields!AmountCur.Value) for Amount Cur text box ,it showing more 13 records total. But  i want Total records total.

Please help me .

Thanks,

Ali.