Just for my own remembering (and anyone who wants to know it), I post a table which summarizes all the development layers within Dynamics AX 4.0. It is easy for me to check my own blog. 😉
Individual companies or companies within an Enterprise can use this layer to make customizations unique to customer installations.
Companies and business partners can modify their installations and add the generic company-specific modifications to this layer.
The layer is included to support the need for in-house development without jeopardizing modifications made by the business partner.
Business partners use this layer, which has no business restrictions, to add any development done for their customers.
Business partners develop and distribute vertical and horizontal solutions to other partners and customers. Solutions in this layer can be protected with license keys with a signed agreement for the Dynamics AX Add-On Solutions program.
The Dynamics AX solutions offices certify and distribute strategic local solutions developed in-house.
The Dynamics AX Sustained Engineering team delivers critical hotfixes using the DIS layer
The Dynamics AX Global Development and Localization team provides a set of GLS layers that contain country-specific functionality for regions in which Dynamics AX is released
This is the lowest model element layer and the location of the standard Dynamics AX application. Only Microsoft has access to the element definitions at this layer.