deleting pwdPolicySubentry attribute

["David Magda" <dmagda@ee.ryerson.ca>]

Hello,

"pwdPolicySubentry" is an operational attribute per slapo-ppolicy(5). I
was able to add it quite easily, but I can't seem to delete it so an
account goes back to using the default policy:

$ ldapsearch -H ldap://master -W -D 'cn=admin,dc=example,dc=com' -b
'dc=example,dc=com' '(uid=dmagda)'  +
Enter LDAP Password:
# dmagda, People, example.com
dn: uid=dmagda,ou=People,dc=example,dc=com
structuralObjectClass: inetOrgPerson
entryUUID: 1b0d0b6c-1115-1030-8396-1ba5239e5e7d
creatorsName: cn=admin,dc=example,dc=com
createTimestamp: 20110512185510Z
pwdPolicySubentry: cn=service,ou=pwpolicies,dc=example,dc=com
entryCSN: 20150602173051.854144Z#000000#000#000000
modifiersName: cn=admin,dc=example,dc=com
modifyTimestamp: 20150602173051Z
entryDN: uid=dmagda,ou=People,dc=example,dc=com
subschemaSubentry: cn=Subschema
hasSubordinates: FALSE

$ cat del.ldif
dn: uid=dmagda,ou=People,dc=example,dc=com
changetype: modify
delete: pwdPolicySubentry

$ ldapsearch -H ldap://master -W -D 'cn=admin,dc=example,dc=com' -f del.ldif
Enter LDAP Password:
[...]
# search result
search: 2
result: 32 No such object

Given that I could add the attribute, was thought that it could be deleted
as well.

Thanks for any info.

Regards,
David