How to get Sum of multiple document within loop

Hii all,
I have a problem in which i stuck ..Actually i am printing sum of quantity from table1 using NL(Sum) function and document no.in filter i am using another NL(Rows) function for reference of Document no. from table2 .i am using NL(Rows) bcause multiple document no. is here and i want sum of quantity for all of them..But currently i am getting sum of first document no.

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