I have a content type
Custom Page and I have created a site column called
CustomPageContentOne (type - Publishing HTML).
When I add this column to the
Custom Page content type from UI, it shows that A duplicate field name
CustomPageContentOne was found. But there is no such field in this content type.
I checked if it already has a hidden field with this name using PowerShell script and it doesn't have this field. Yet it is showing such error.
Any ideas what's going on?