Rights to create a new entry

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Hi,

I would like to autorize my users to create new entry
below their own. I read a lot of thing into the faq,
I manage to get ACL give the right to write to an
entry below a specific entry, but impossible to give
the right to create a brand new entry. In the log file,
it claims about access to "cn=SubSchema".

Can someone say me what are the minimum rights to create
a new entry ?

Thanks in advance

Cordially

Denis