[limbero]

The person you're talking to is mistaken, the use of Postnord is not defined in law, it's contractual. The Swedish government has a centrally negotiated contract with Postnord to do all of their deliveries, and Transportstyrelsen did not believe they were authorized to break that contract – even with the strike causing Postnord to not live up to their end. It makes sense to me that the court system was needed to decide that the contract in practice is void in situations like this.