Anjali,
I have created this example report. THis report works correctly and assigns the data from a dynamically created structure of type TS_2 to a static defined structure of type TS_1 with more fields.
As you can see data of the fields FIELD1 and FIELD2 is transferred from the dynamic structure to the static structure. I have run the report and checked in debugging that the values are copied. Is your example like this one?
