Enforce mutual exclusiveness of hierarchies and sort by

frontend/src/app/components/wp-fast-table/state/wp-table-hierarchy.service.ts

@@ -42,11 +42,16 @@ export class WorkPackageTableHierarchiesService extends WorkPackageTableBaseServ
     state.current = active;
     state.last = null;
 
-    // hierarchies and group by are mutually exclusive
     if (active) {
+      // hierarchies and group by are mutually exclusive
       var groupBy = this.tableState.groupBy.value!;
       groupBy.current = undefined;
       this.tableState.groupBy.putValue(groupBy);
+
+      // hierarchies and sort by are mutually exclusive
+      var sortBy = this.tableState.sortBy.value!;
+      sortBy.current = [];
+      this.tableState.sortBy.putValue(sortBy);
     }
 
     this.state.putValue(state);

frontend/src/app/components/wp-fast-table/state/wp-table-sort-by.service.ts

@@ -77,6 +77,14 @@ export class WorkPackageTableSortByService extends WorkPackageTableBaseService<W
   }
 
   public applyToQuery(query:QueryResource) {
+    if (this.current.current.length > 0) {
+      // hierarchies and sort by are mutually exclusive
+      var hierarchies = this.tableState.hierarchies.value!;
+      hierarchies.current = false;
+      hierarchies.last = null;
+      this.tableState.hierarchies.putValue(hierarchies);
+      query.hierarchies = hierarchies.current;
+    }
     query.sortBy = cloneHalResourceCollection<QuerySortByResource>(this.current.current);
     return true;
   }