[389-users] error code 50 - Insufficient 'write' privilege to the 'unhashed#user#password' attribute of entry

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Got the following error when trying to ADD "userPassword" attribute to an entry, but the same user has no problem to REPLACE or DELETE "userPassword" attribute. The use has the "write" privillage to "userPassword" attribute.

error code 50 - Insufficient 'write' privilege to the 'unhashed#user#password' attribute of entry

DS version 1.2.10.12

Does it mean that ADD "userPassword" attribute will automatically ADD 'unhashed#user#password' attribute ?

Is there a way to disable it?

Thanks.