How to apply two conditions in Suppress in Section Expert

Hi,

I need your help in applying to conditions in the Details section for the suppress in the Section Expert. My Report looks like:

Details A: {@SUM -DR}   {@SUM -CR}   {@SUM -Balance} {@TT-CLASS}

Details B: {Deal_No}   {Image_No}   {Amount}   {@Comments}  

Currently, I am applying a condition to suppress both Details A and Details B in the section expert:

{@TT-CLASS}="OB"

Now while running the report, I got some duplicated deals ex:

123   1   1000   Reversal

123   1   1000   Reversal

124   2   2000   Approved

So I applied a condition in the section expert for the details A and B which is:

({Deal_No} = next({Deal_No} ) and {Image_No} =next( {Image_No} ))

or 

{@TT-CLASS}="OB"

And it is still giving me the duplicated deals when I am running the report. So can you please help.

Thanks