Not able to execute service from Thingworx

I am trying to execute one service called GetFields which exist as a part of integrity connector.

I am not able to understand the input set. I have created a custom data shape for data Shape name input field. Also provided on field name in field names input.

Now what needs to be provided for last dataShape Field. When i click it it gives me error : Must have datashape defined to add rows.

I also tried to create a wrapper thing to call this thing's services but no luck there as well. I get Nullpointer exception.

I am able to execute other services which does not require input or need simple input.

Any help would be appreciated.