The customer has renamed some node types in his definitons.cnd file. However, the original node types are still available in Edit mode.
These nodes are present under this JCR path: /jcr:system/jcr:nodeTypes/
The customer has tried to remove the nodes from this path via the JCR Browser but he got this exception:
javax.jcr.nodetype.ConstraintViolationException: Unable to perform operation. Node is protected : /jcr:system/jcr:nodeTypes/ea:lastNewsexpress
All node types under /jcr:system/jcr:nodeTypes/ cannot be removed as these nodes are protected.
The solution is to remove the node types via the Installed definitions browser tool in Jahia tools.
The procedure is the following one: