I once had a work contract which stated: (loosely translated) if all three parties agree, the employee will move from the current employer to the employer where the employee is sub-contracted. Where the three parties where me, the company where I was actually working for (the one that payed my salary) and the company I did the actual job.
Even though that contract was specifically made so that I would go over to that second company, it still stated that the first company also had to agree. So, I think it's just a standard way to put such choices in a contract.
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