I don't know exactly what context you're using to create this new attributeType definition. I don't think I would go about this in the way you have done. There are easier ways to do it.
Regardless in ADS you can just delete the AT definition under the ou=schema,cn=attributeTypes branch of the DIT then start over. Or you can do a modify on the m-equality attribute of the entry corresponding to your AT definition that you want changed.
I remove the attribute by reinstalling the server.
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