UI Annotation using Business Ruleshttps://www.dotnetzone.gr:443/cs/blogs/abekiaris/archive/2013/05/01/ui-annotation-using-business-rules.aspxXAF already provides strong and flexible validation for any object that fits specified Rules with build-in the Validation Module . In this post you can find a sample XAF application which extends the Validation to provide support for Warning/InformationelCommunityServer 2.1 SP3 (Build: 20423.1)