diff --git a/packages/common/business_components/src/ui/sdmInsertForm/index.tsx b/packages/common/business_components/src/ui/sdmInsertForm/index.tsx
index 4091139b9..1629c78ed 100644
--- a/packages/common/business_components/src/ui/sdmInsertForm/index.tsx
+++ b/packages/common/business_components/src/ui/sdmInsertForm/index.tsx
@@ -42,7 +42,7 @@ const createFormSchema = (isBznmTotNoDisabled: boolean, isDuplicate: boolean ,up
     .min(8, "전화번호는 8자 이상 입력해주세요")
     .max(11, "전화번호는 11자 이내로 입력해주세요")
     .regex(/^[0-9]+$/, "전화번호는 숫자만 입력 가능합니다"),
-    rgtr: z.string().optional(),
+    rgtr: z.string().nullish(),
     dmdAplyPswd	: updateList?.dmdInfoId // 업데이트일경우
     ? z.string().optional() // 패스워드는 선택 사항이며 길이 제한 없음
     : z.string().optional()