I have a “France sauf CTOM” Trainee visa type D, validated with OFII Permit. It is valid from 01/Nov/14 to 01/Nov/15. I did an internship in France for 6 months from Nov 14 to May 15.
Now currently I am in India and I would like to pursue an internship in Belgium using this visa from September 2015 to end of October 2015. Will it be a problem? I think it won't since the long term D visa is valid for a maximum of 3 months in a period of 180 days.