Writer: addinf field condition with a '.' in the field name

I have a contact database which several fields. Some of the fields has special characters like a ‘.’ in the field name (e.g. “contacts.contacts.company.name” where “contacts.contacts” is the database and “company.name” is the field name).

How can I access this fields in a condition field? I have tried already several things like

  • “contacts.contacts.company.name”
  • contacts.contacts.“company.name”
  • [contacts.contacts.company.name]
  • contacts.contacts.companyname

without any success …