Because HR groups people by function and finance groups cost by centre, and the two structures are maintained separately. Reconciling headcount to cost then needs a mapping table nobody owns.
The grouping of people into departments, and the mapping from those to the cost centres finance reports on.
Both live on the personnel record. A department maps to a cost centre once, and every report on either side reads the same assignment.
Marketing is one department and one cost centre. Headcount, payroll cost and budget variance all report against it without anyone maintaining a correspondence.
It does not support a person split across two cost centres by percentage. One primary assignment, with project-level allocation handled in Loop.
Books posts payroll cost to the cost centre. Budgets compare against it. Record scopes can be departmental.
Yes, following the reporting structure.
That works. The mapping is many-to-one, not one-to-one.
HR, on the personnel record. Finance reads it.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.