Developers often need to change the current application object layer. For example, customizations in AX 2012 always take place in the USR layer. To change it:
1. Go to Microsoft Dynamics AX 2012 Configuration
2. Click Manage then click Create configuration
3. Give it a suitable name and then click OK
4. Switch to Developer tab and choose your desired layer from the drop down menu of Application object layer.
5. Click OK