diff --git a/modules/costs/frontend/module/augment/cost-budget-subform.augment.service.ts b/modules/costs/frontend/module/augment/cost-budget-subform.augment.service.ts
index cd68906703..1aa31e138c 100644
--- a/modules/costs/frontend/module/augment/cost-budget-subform.augment.service.ts
+++ b/modules/costs/frontend/module/augment/cost-budget-subform.augment.service.ts
@@ -97,7 +97,7 @@ export class CostBudgetSubformAugmentService {
   private buildRefreshRequest(row:JQuery, row_identifier:string) {
     let request:any = {
       element_id: row_identifier,
-      fixed_date: row.find('#cost_object_fixed_date').val()
+      fixed_date: jQuery('#cost_object_fixed_date').val()
     };
 
     // Augment common values with specific values for this type
diff --git a/modules/costs/spec/features/budgets/update_budget_spec.rb b/modules/costs/spec/features/budgets/update_budget_spec.rb
index ea7d37186b..24826b683c 100644
--- a/modules/costs/spec/features/budgets/update_budget_spec.rb
+++ b/modules/costs/spec/features/budgets/update_budget_spec.rb
@@ -97,12 +97,19 @@ describe 'updating a budget', type: :feature, js: true do
       budget_page.visit!
       click_on 'Update'
 
+      budget_page.expect_planned_costs! type: :material, row: 1, expected: '150.00 EUR'
+      budget_page.expect_planned_costs! type: :labor, row: 1, expected: '125.00 EUR'
+
       budget_page.edit_unit_costs! material_budget_item.id, units: 5,
                                                      comment: 'updated num stimpaks'
       budget_page.edit_labor_costs! labor_budget_item.id, hours: 3,
                                                    user_name: user.name,
                                                    comment: 'updated treatment duration'
 
+      # Test for updated planned costs (Regression #31247)
+      budget_page.expect_planned_costs! type: :material, row: 1, expected: '250.00 EUR'
+      budget_page.expect_planned_costs! type: :labor, row: 1, expected: '75.00 EUR'
+
       click_on 'Submit'
       expect(budget_page).to have_content('Successful update')
 
diff --git a/modules/costs/spec/support/pages/budget_form.rb b/modules/costs/spec/support/pages/budget_form.rb
index 4cce97dc23..8e41791ede 100644
--- a/modules/costs/spec/support/pages/budget_form.rb
+++ b/modules/costs/spec/support/pages/budget_form.rb
@@ -100,6 +100,16 @@ module Pages
       @labor_rows = labor_rows + 1
     end
 
+    def expect_planned_costs!(type:, row:, expected:)
+      raise "Unknown type: #{type}, allowed: labor, material" unless %i[labor material].include? type.to_sym
+
+      retry_block do
+        container = page.all("##{type}_budget_items_fieldset td.currency.budget-table--fields")[row - 1]
+        actual = container.text
+        raise "Expected planned costs #{expected}, got #{actual}" unless expected == actual
+      end
+    end
+
     def unit_costs_at(num_row)
       unit_costs_container.all('tbody td.currency')[num_row - 1]
     end