diff --git a/app/models/queries/work_packages/selects/work_package_select.rb b/app/models/queries/work_packages/selects/work_package_select.rb
index 90ed98e5f530..9b9603518367 100644
--- a/app/models/queries/work_packages/selects/work_package_select.rb
+++ b/app/models/queries/work_packages/selects/work_package_select.rb
@@ -47,7 +47,7 @@ def self.select_group_by(group_by_statement)
     group_by = group_by_statement
     group_by = group_by.first if group_by.is_a?(Array)
 
-    "#{group_by} id"
+    "#{group_by} group_id"
   end
 
   def self.scoped_column_sum(scope, select, grouped:, query:)
diff --git a/app/models/query/results/sums.rb b/app/models/query/results/sums.rb
index d349e199f2f9..6da74e8cfba6 100644
--- a/app/models/query/results/sums.rb
+++ b/app/models/query/results/sums.rb
@@ -43,10 +43,10 @@ def all_group_sums
     return nil unless query.grouped?
 
     sums_by_id = sums_select(true).inject({}) do |result, group_sum|
-      result[group_sum["id"]] = {}
+      result[group_sum["group_id"]] = {}
 
       query.summed_up_columns.each do |column|
-        result[group_sum["id"]][column] = group_sum[column.name.to_s]
+        result[group_sum["group_id"]][column] = group_sum[column.name.to_s]
       end
 
       result
@@ -59,7 +59,7 @@ def all_group_sums
 
   def sums_select(grouped = false)
     select = if grouped
-               ["work_packages.id"]
+               ["work_packages.group_id"]
              else
                []
              end
@@ -96,7 +96,8 @@ def sums_callable_joins(grouped)
     callable_summed_up_columns
       .map do |c|
         join_condition = if grouped
-                           "#{c.name}.id = work_packages.id OR #{c.name}.id IS NULL AND work_packages.id IS NULL"
+                           "#{c.name}.group_id = work_packages.group_id OR " \
+                             "#{c.name}.group_id IS NULL AND work_packages.group_id IS NULL"
                          else
                            "TRUE"
                          end
diff --git a/modules/costs/spec/lib/costs/query_currency_select_spec.rb b/modules/costs/spec/lib/costs/query_currency_select_spec.rb
index 8139e7f1c884..90794f8d2985 100644
--- a/modules/costs/spec/lib/costs/query_currency_select_spec.rb
+++ b/modules/costs/spec/lib/costs/query_currency_select_spec.rb
@@ -98,7 +98,7 @@
         )
 
         expect(ActiveRecord::Base.connection.select_all(instance.summable.(query, true).to_sql).columns)
-          .to match_array %w(id material_costs)
+          .to match_array %w(group_id material_costs)
       end
     end
   end
@@ -136,7 +136,7 @@
         )
 
         expect(ActiveRecord::Base.connection.select_all(instance.summable.(query, true).to_sql).columns)
-          .to match_array %w(id labor_costs)
+          .to match_array %w(group_id labor_costs)
       end
     end
   end