I want to edit the report "report_deliveryslip" because I want the products not to be repeated. If one product is in two differents. If a product is in two different places in the warehouse, in this report I get that product 2 times, but I want it to come out once with the total amount. How can I do it?  

For example, in the report appear like this:

product "ABC" with quantity of 5 Units.

product "ABC" with quantity of 3 Units.

But I want it to appear like this:

product "ABC" with quantity of 8 Units.