Monika,
In Lesson E07.01 we write the following:
Contingency Reserve : The amount of funds, budget, or time needed above the estimate to reduce the risk of overruns of project objectives to a level acceptable to the organization.
Management Reserve : Budget reserves for unplanned changes to the project.
And in the narrative I explain that Contingency Reserve is part of the project budget, but that the Management Reserve is not, but instead it is part of the overall budget of the department and can be assigned to any project that is in trouble and needs additional cash to overcome those troubles.