Resolving, as fix does not seem to lie within Horde.

The only way to fix this problem at the moment seems to be modifying 
the OpenLDAP core.schema directly:

|The error: "Inappropriate Matching" will be displayed if the 
attribute you are trying to delete has no equality rule in the schema. 
  I had a problem deleting the attribute facsimilieTelephoneNumber, 
and it was because my core.schema file did not have an EQUALITY 
definition for that attribute.  I copied the telephoneNumber EQUALITY 
rule and it worked perfectly.|



Before the change:

attributetype ( 2.5.4.23 NAME ( 'facsimileTelephoneNumber' 'fax' )

        DESC 'RFC2256: Facsimile (Fax) Telephone Number'

        SYNTAX 1.3.6.1.4.1.1466.115.121.1.22 )

After the change:

attributetype ( 2.5.4.23 NAME ( 'facsimileTelephoneNumber' 'fax' )

        DESC 'RFC2256: Facsimile (Fax) Telephone Number'

        EQUALITY telephoneNumberMatch

        SYNTAX 1.3.6.1.4.1.1466.115.121.1.50{32} )



Not the nicest way to solve the problem, but it works with no side affects!

I've seen this occasionally also, but it seems to be something in how 
the LDAP server attributes are set up; it doesn't allow it to be empty.



Any idea on how to fix this would be great.

I've got an entry in the ldap, for instance "facsimiletelephonenumber" 
with a valid fax number. Now I want to remove the fax number, I can't 
have an empty value in Turba. I receive the following message in 
Horde/Turba: "There was an error updating this entry: Modify failed: 
(18) Inappropriate matching".

The corresponding OpenLDAP entries (2.2.19) are as follows:

Dec 15 17:20:51 sbx-017 slapd[15716]: ldbm_modify_internal: delete

Dec 15 17:20:51 sbx-017 slapd[15716]: ldbm_modify_internal: 18 
modify/delete: facsimileTelephoneNumber: no equality matching rule

Dec 15 17:20:51 sbx-017 slapd[15716]: send_ldap_result: conn=48 op=3 p=3

Dec 15 17:20:51 sbx-017 slapd[15716]: send_ldap_result: err=18 
matched="" text="modify/delete: facsimileTelephoneNumber: noequality 
matching rule"

Dec 15 17:20:51 sbx-017 slapd[15716]: send_ldap_response: msgid=4 
tag=103 err=18

Dec 15 17:20:51 sbx-017 slapd[15716]: conn=48 op=3 RESULT tag=103 
err=18 text=modify/delete: facsimileTelephoneNumber: no equality 
matching rule



As a workaround I just pass a white character to the interface :-(