diff --git a/app/Exceptions/Handler.php b/app/Exceptions/Handler.php
index 3928ffed..671d3b3b 100644
--- a/app/Exceptions/Handler.php
+++ b/app/Exceptions/Handler.php
@@ -84,6 +84,7 @@ public function render($request, Throwable $exception)
                 return response()->json([
                     'success' => false,
                     'message' => '입력값 검증 실패',
+                    'errors' => $exception->errors(),
                     'error' => [
                         'code' => 422,
                         'details' => $exception->errors(),
diff --git a/app/Http/Requests/ItemMaster/IndependentFieldStoreRequest.php b/app/Http/Requests/ItemMaster/IndependentFieldStoreRequest.php
index 52acba9f..3350d6b2 100644
--- a/app/Http/Requests/ItemMaster/IndependentFieldStoreRequest.php
+++ b/app/Http/Requests/ItemMaster/IndependentFieldStoreRequest.php
@@ -16,7 +16,7 @@ public function rules(): array
         return [
             'group_id' => 'nullable|integer',
             'field_name' => 'required|string|max:255',
-            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z][a-zA-Z0-9_]*$/',
+            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z0-9][a-zA-Z0-9_]*$/',
             'field_type' => 'required|in:textbox,number,dropdown,checkbox,date,textarea',
             'is_required' => 'nullable|boolean',
             'default_value' => 'nullable|string',
diff --git a/app/Http/Requests/ItemMaster/ItemFieldStoreRequest.php b/app/Http/Requests/ItemMaster/ItemFieldStoreRequest.php
index 9092538e..ecaaadd5 100644
--- a/app/Http/Requests/ItemMaster/ItemFieldStoreRequest.php
+++ b/app/Http/Requests/ItemMaster/ItemFieldStoreRequest.php
@@ -16,7 +16,7 @@ public function rules(): array
         return [
             'group_id' => 'nullable|integer|min:1', // 계층번호
             'field_name' => 'required|string|max:255',
-            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z][a-zA-Z0-9_]*$/',
+            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z0-9][a-zA-Z0-9_]*$/',
             'field_type' => 'required|in:textbox,number,dropdown,checkbox,date,textarea',
             'is_required' => 'nullable|boolean',
             'default_value' => 'nullable|string',
diff --git a/app/Http/Requests/ItemMaster/ItemFieldUpdateRequest.php b/app/Http/Requests/ItemMaster/ItemFieldUpdateRequest.php
index cd919314..51c5236f 100644
--- a/app/Http/Requests/ItemMaster/ItemFieldUpdateRequest.php
+++ b/app/Http/Requests/ItemMaster/ItemFieldUpdateRequest.php
@@ -15,7 +15,7 @@ public function rules(): array
     {
         return [
             'field_name' => 'sometimes|string|max:255',
-            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z][a-zA-Z0-9_]*$/',
+            'field_key' => 'nullable|string|max:80|regex:/^[a-zA-Z0-9][a-zA-Z0-9_]*$/',
             'field_type' => 'sometimes|in:textbox,number,dropdown,checkbox,date,textarea',
             'is_required' => 'nullable|boolean',
             'default_value' => 'nullable|string',