Add consideration for potentially incorrect cost driver calculations

src/overhead_allocation.rs

@@ -245,6 +245,13 @@ where
         let allocation_statistic = area.get("AllocationStatistic").unwrap();
         let department_type: DepartmentType = DepartmentType::from(area.get("Type").unwrap());
 
+        // TODO: I don't think this check is enough. I think we actually need to check the allocation statistic too,
+        // and whether it holds the account types is cares about. If it's the wrong account type, then we should discard
+        // all ccs in this area.
+        // This is because I found some lines where the account is the right type (e.g. expense), however there was
+        // an overhead cc in that account, which had an area that had an allocation statistic that only applied
+        // to unit accounts, so that cost centre probably shouldn't have been included at all. I don't think it
+        // messed up the calculation in this instance, but there may be other cases that do get tripped up by this
         if department_type == DepartmentType::Overhead {
             let current_area_ccs = area_ccs.get(area_name);