CA Identity Manager: Not able to remove the attributes from management console

Document ID : KB000102418
Last Modified Date : 18/06/2018
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Issue:
It is not possible to remove a custom attribute from the user directory using CA IDM management console by taking export and removing the attribute and importing it back. 
Resolution:
You cannot remove a single attribute from an existing directory. You must export the directory.xml, remove the attribute and then create a new directory and import the modified directory.xml as an entirely new directory.