Complex return type for operations in Application Services

Hi all,
I am trying to create a complex return type for one of operation in CAF Application service.I have created a complex dataStructure named productList and added product bussiness object as its attribute with cardinality 0--n. And used product dataType as my return type.
But I am not getting any output but its work fine with cardinality 0--1.
I am using CE 7.1 SP5 trial version.......
Can anyone

Hi,
And used product dataType as my return type.
Are you sure you did not forgot to change you operations return type to "productList"?
Best regards
Philipp

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