Nested Grid issue

I am using SmartGWTPower 2.5

I essentially reproduced my own version of the Nested Grid example in the showcase. However for some reason rather than displaying only related records, the nested grid displays all records in the DS, even though the request clearly states that it is looking for exact matches on missionId. Any ideas what I am doing wrong?

DSRequest:

DataSources are expected to do server-based filtering based on the criteria, unless you’ve set clientOnly:true to indicate that you want the entire DataSource behavior simulated client side.