Curiously, the term "line manager" denotes the person that is in charge of promotion, development, review and vacation request approval + expenses approval of a

Curiously, the term "line manager" denotes the person that is in charge of promotion, development, review and vacation request approval + expenses approval of a report (rather than the development of new product lines, which is nowadays done by distributed team in matrix settings led by a "project lead" or "technical lead"), so one would classify them as support, perhaps. To confuse things further, the "project manager" isn't the most senior manager of the project, but its _administrator_(the "project owner" is responsible for the project).