How to add data to collection Row

[RaulSamayoa]

Using the utility - collection manipulation object I am trying to add values to a row in a collection but I have been unsuccessful. I have a blank collection and add a row. I have a data item called one with a value of "one" and another data item two with a value of "two".   I am trying to add one to column aa.a and two to column aa.b through the set collection field in an action but have not been able to do it. any ideas?  

[John__Carter]

Just use a calculation with [one] as the expression and aa.a as the Store In destination.

[Shruti_AnilNark]

Add an empty row before you start setting the values of fields. It helped in my case.

[Ravendra_BabuCh]

Check set collection action input values, in your case enter field name like ""a"". it helped. Use another method with calculation stage, enter data item in expression and collection field name in result.