dividing percentage between positions

Hello all,

I am adding different positions belonging to a document from the itab and calculating the percentage based on the percentage amount from another document.

I am using here at new docnr

                         sum

then respective calculations.

The above is working fine with one document, but when there are more than one document with additional positions, it is not doing the calculations correctly.

is there any other way other than at new and sum? that we can use to sum itab columns.

thanks,

Kumar