miguelfuerte a few things:
The "filters" configuration needs to be part of the storeConfig. In your code above it is part of the gridConfig.
storeConfig: {
filters: [{
property: "Iteration.Name",
value: "Sprint 3"
}]
}
Also, the filter for a property of "Iteration" will expect a reference to the Iteration reference. For that particular implementation, you will want to use property: "Iteration.Name". There is good information about queries and using dot notation here: General Query Examples | CA Agile Central Help