There are three layers available only to Microsoft to deliver the base application.   Layer   SYS, SYP System layer:  The standard application is developed in this lowest layer. This includes the core application and the localization for most countries.   GLS, GLP Globalization layer: Includes features developed for some countries that were not yet moved into the SYS layer.   FPK, FPP Feature Pack layer: Includes industry feature packs that are controlled by Microsoft.   There are three layers available to partners and ISVs.  Layers   SLN, SLP Solution layer:  Includes Microsoft endorsed industry solutions.   ISV, ISP Independent Software Vendor layer:  Includes generic or vertical solutions developed by ISV's.   VAR,VAP Value Added Reseller layer:   Includes multi-customer solutions developed by VAR's.    There are two layers available to both partners and customers who have a license to access the AX source code.   Layer  CUS, CUP Customer layer: Includes customer specific ...