Aalborg University is a public university in Denmark (just as the other seven Danish universities). This means that a majority of rules at the university originate from national legislation.
In some areas the national legislation and politics are frameworks that provide the university many possibilities of setting up their own way of doing things within this framework. This applies to i.e. research and teaching.
In other areas the legislation is quite strict and consists of detailed instructions on what is/is not possible and how things should be done. This applies to i.e. bookkeeping and employment conditions.
Employment conditions in the state sector are almost always agreed upon in collective agreements between trade unions on behalf of the employees and the Danish Finance Ministry on behalf of the state as an employer.
You can read more about working in the Danish state sector in the booklet below issued by the Finance Ministry.