Filter - greater or equal - ORDERING

["Andreas Schoe" <andi@gfz-potsdam.de>]

Hello,

I want to use following filter: "uid>=branch" (greater or equal). 

Log entry: filter="(?=undefined)".

I searched the web and found out that I have to add an ORDERING rule to the
attribute type definition of 'uid'. 

Is that right?

Where can I add this rule, in core.schema the type definition of 'uid' is a
comment. I uncomment it but slapd says the attribute is declared twice. I
can´t find any other entries. In cosine.schema the entry is a comment too.

Where did I found the definition?

(openldap 2.3.38)

Andreas