Invalid Syntax error (maybe has to do with accents)

[Jorge Santos <jsf@dep3.fciencias.unam.mx>]

When trying to do an ldapadd I get the following error:

adding new entry "uid=csg,ou=People,dc=fciencias,dc=unam,dc=mx"
ldap_add: Invalid syntax
        additional info: cn: value #0 invalid per syntax

ldif_record() = 21

Here is the said entry:

dn: uid=csg,ou=People,dc=fciencias,dc=unam,dc=mx 
uid: csg 
cn: Concepción Sánchez González 
objectClass: account 
objectClass: posixAccount 
objectClass: top 
objectClass: shadowAccount 
userPassword: {crypt}$1$QMHhbUgc$xDATjxBUVIahsL8a4DeiJ0 
shadowLastChange: 11593 
shadowMax: 99999 
shadowWarning: 7 
loginShell: /bin/zsh 
uidNumber: 606 
gidNumber: 700 
homeDirectory: /home/dgae/csg 
gecos: Concepción Sánchez González 

I think is an issue with accents, but I can't find anything in the
OpenLDAP website (or elsewhere) related to this problem.

Any ideas about what might be causing the problem?

Thanks in advance

Jorge Santos