d7f2e992_rt_Programming_Model__AX_2012___Description
[Concept] Group and order [When to override] In Visual Studio, you can create groups and orders, and preview them in Visual Studio and the Microsoft Dynamics AX client. [Description] 
You specify the group and order as follows: If you are using an RDP class, specify them on the contract or in Visual Studio. If you are using a query or data method, specify them by using report designer. If you are using a mix of an RDP class, query, and data method, specify them by using Visual Studio.
Report Programming Model [AX 2012]