The following table describes the application object layers in Microsoft Dynamics AX:
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Layer
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Description
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USR
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The user layer is for user modifications, such as reports.
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CUS
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The customer layer is for modifications that are specific to a company.
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VAR
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Value Added Resellers (VAR) can make modifications or new developments to the VAR layer as specified by the customers or as a strategy of creating an industry specific solution.
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ISV
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When an Independent Software Vendor (ISV) creates their own solution, their modifications are saved in the ISV layer.
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SLN
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The solution layer is used by distributors to implement vertical partner solutions.
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FPK
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The FPK layer is an application object patch layer reserved by Microsoft for future patching or other updates. For more information, see Patch Layers.
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GLS
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When the application is modified to match country or region specific legal demands, these modifications are saved in the GLS layer.
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SYS
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The standard application is implemented at the lowest level, the SYS layer. The application objects in the standard application can never be deleted.
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Each layer has a corresponding patch layer that can be used to incorporate updates to your application or to store conflicts when you import models into a layer. For more information about patch layers
