Solutions functionality in Dynamics CRM https://msdn.microsoft.com/en-us/library/gg334576.aspx Solution Import version compatibility of managed/unmanaged solutions and customizations http://msdn.microsoft.com/en-us/library/gg334576.aspx Layering of managed/unmanaged solutions and customizations Solution Import version compatibility Layering of managed/unmanaged solutions and customizations version compatibility section of the CRM SDK, MSDN Layering of managed/unmanaged solutions and customizations