If employed: a statement from the employer including leave certificate on company's letterhead.
Letter from the representing Indian company detailing: name, designation of the applicant and of the signatory (not less than managerial or executive level), outline of travel itinerary, purpose the visit, names & addresses of companies intended to visit.
Letter of invitation in original from the Dutch company detailing name of the invitee, dates of the intended stay, Purpose, nature of costs being covered (boarding & lodging). Proof of financial support such like foreign exchange (endorsed in the passport), international credit card copy.
If applicant being the proprietor of the business: