This embodiment of the allocation table could include a media ID written in the third column (in this case the second media ID) in the hierarchy that is higher than the media ID written in the second column (in this case the first media ID). In such an embodiment of the allocation table, the media ID written in the second column in the row of the identifier can be regarded as the default (default media ID). If no media ID is entered in the row of the identifier in the third column, the default media ID stored in the second column is used as the media ID assigned to the identifier. However, if a media ID is entered in the third column in the identifier row, then—even if a media ID is entered in the second column in the identifier row—the media ID entered in the third column of the identifier row is used as the identifier. In a preferred embodiment of this embodiment, the user can only make an entry in the third column using the program routine. In this way it can be ensured that the specific identifier in the allocation table is always assigned a media ID.
In a preferred embodiment, a locking attribute is allocated to the assignment of an identifier to a media ID in the allocation table. The presence of a locking attribute can be used to restrict the possibility of making changes to the assignment of an identifier to a media ID in the allocation table to only specific users of a user group, for example the administrator of a user group.