Soon I have some experience with migrating solution from SharePoint 2010 to SharePoint 2013. The migration was on 3 steps. First one was just to copy the custom fields, content types and list definitions from the old VS 2010 project into a new VS 2012 project for SharePoint 2013. Looks like pretty simple task but ….. The problem: Error “ A duplicate field name "xxxx" was found ” when the feature for provisioning the fields and content types is activated. The solution: Review the field definitions and make sure no field has Name property equal to some of the ‘reserved’ values. Explanations: In SharePoint 2010 there was no problem to have these fields as a definition of custom fields: < Field Type = " Note " ID = " {893FB9BC-2DA4-4451-A1D1-88010CDC6A08} " Name = " Description " StaticName = " Description " DisplayName = " Description 1 " Requi...
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