Key legal question
Which social security legislation applied to the respondent's cross-border work in Bulgaria under the FZA/Regulation 1408/71?
Extracted holding
The applicable system was that of the Netherlands, as the employer's seat was the decisive connecting factor in this third-state work situation.
Extracted reasoning
The coordination rules left this constellation unregulated; following Aldewereld, the worker's residence in Switzerland did not justify Swiss contributions when the employment was with a Dutch employer and the work was performed outside the EU/EEA territory.