I have a valid multiple entry Schengen visa from Netherlands Embassy. It says BNL2 and type of Visa as "C". I went to Netherlands on business visit.
I want to travel to Spain now for tennis training of my daughter. Can I travel to Spain on the same visa now?
There is no such thing as a "business" and "tourist" visa in the Schengen system. There are only uniform short-stay visas, which is what you have.
Given that the visa is multiple-entry, the point of being multiple entry is that you can use it for any subsequent visit to anywhere in the Schengen area that satisfies the rules for a short visit.
According to Annex 22 of the Handbook for the processing of visa applications and the modification of issued visas, BNL2 is the code for a visa issued by Belgium, the Netherlands, or Luxembourg "ex officio." I don't quite know what that means, however.
Regardless, Henning Makholm's answer is correct: it does not restrict your use of the visa. To impose any restriction, there would be a less cryptic annotation describing the restriction.
