Grand Total in Hierarchial report

Hi Experts,

In my Hirerachial report I am displaying the subtotal based on the Internaltable A when ever the field 1 value changes.

same way I need to display GrandTotal below the subtotal whenever the Internal Table A Field 2 value changes.

Pls provide what changes I need to make in key or fieldcatalog

I already given the below key

key-header01 = "field1"

ker-item01 = 'field1'

key-header01 = "field2"

ker-item01 = 'field2'

and in Fieldcatalog both the filed Do_sum = 'X".

Pls give solution for this.

Thanks in advance

sai