diff --git a/src/pages/04_product-service/MainPage.vue b/src/pages/04_product-service/MainPage.vue
index 21681acb..212f91c9 100644
--- a/src/pages/04_product-service/MainPage.vue
+++ b/src/pages/04_product-service/MainPage.vue
@@ -1210,6 +1210,7 @@ function submitAddWorkProduct() {
     if (!productExists) {
       workItems.value[currentWorkIndex.value].product.push({
         ...i,
+        installmentNo: 1,
         nameEn: '',
       });
       workItems.value[currentWorkIndex.value].attributes.stepProperties.forEach(