problem configuring overlay module and cn=config

[Alex Samad <alex@samad.com.au>]

Hi

I am trying to ldapadd


dn: olcOverlay={2}unique,olcDatabase={1}hdb,cn=config
changetype: modify
add: olcunique_uri
olcunique_uri: ldap:///?uid?sub


but it fails
ldap_modify: Undefined attribute type (17)
        additional info: olcunique_uri: AttributeDescription contains
	inappropriate characters


not sure what is going wrong I tried changing to base64 and using ::

Can't seem to find any examples of using unique in cn=config

Thanks

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