Even though the term invitation letter sounds simple enough, it's a bit more complicated than that. What your doing is getting into a legal contract between yourself/company and the Belgian ministry of the interior. You agree to be liable for all expenses in case this person doesn't leave Belgium/Schengen zone as foreseen. In case of a forced expulsion this is thousands of euros. I would also be very surprised if it's still possible to accomplish all the needed paperwork in one month. It involves going to the municipality, they need to contact the ministry of the interior and they in turn need to contact the embassy of the country, back and forth. The person also needs to present themselves at this embassy, at least twice. The process usually takes 3 - 8 months. Anyway it's not something you'd do for any random person either. A lot of trust is involved. Jo