Updating a row in collection

Hi All

I have a collection( Named Results) with 4 columns. The data in this collection is pulled from a master collection.

I have added the 5th column in the collection (Results) reference number through utility manipulation.

What i wanted to do when my process runs and generates a reference number that should go and update in the 5th column for each row (say i have 10 rows of data).

I tried using loop , calculation , data item. but the data gets updated only in the first row. Meaning lets say my process generated 10 reference numbers i can see the last one only that in the first row.

Can u suggest some work around.
 
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