diff --git a/src/components/04_product-service/ServiceProperties.vue b/src/components/04_product-service/ServiceProperties.vue
index 6c82151d..6a85f897 100644
--- a/src/components/04_product-service/ServiceProperties.vue
+++ b/src/components/04_product-service/ServiceProperties.vue
@@ -546,7 +546,7 @@ function confirmDelete(items: unknown[], index: number) {
                         input-class="text-caption"
                         :label="$t('selection')"
                         :rules="[
-                          (val) => (!!val && i >= 1) || $t('pleaseInformation'),
+                          (val) => (!!val && i <= 1) || $t('pleaseInformation'),
                         ]"
                         hide-bottom-space
                       />