Data Access Overview
In earlier versions of Enterprise Portal, data access was defined by using data sources that were accessed by Web Forms and Web Reports. The ASP.NET-based framework now used accesses data through data sets. Data sets in Microsoft Dynamics AX provide a generic data access layer that allows for external presentation layers (like Enterprise Portal) to bind to Microsoft Dynamics AX tables and data types.
Enterprise Portal can be set up to search for data in Microsoft Dynamics AX. If you create additional tables, you should consider making them available through this search mechanism.