diff --git a/modules/core/src/common/dto/base.schemas.ts b/modules/core/src/common/dto/base.schemas.ts
index 867561e4..e842368d 100644
--- a/modules/core/src/common/dto/base.schemas.ts
+++ b/modules/core/src/common/dto/base.schemas.ts
@@ -3,15 +3,17 @@ import { z } from "zod/v4";
 /**
  * Cadena con valor numérico:
  *
- * - Acepta: "" o "123456" (solo dígitos).
- * - Rechaza: "1 23", "abc123", "12v34", "+123", "12.3"
+ * - Acepta: "", "123456", "-2433", "-1", "0" (solo dígitos y simbolo negativo).
+ * - Rechaza: "1 23", "abc123", "12v34", "+123", "12.3", "- 22"
  *
  * */
 
 export const NumericStringSchema = z
   .string()
   .trim()
-  .regex(/^\d*$/, { message: "Must be empty or contain only digits (0-9)." });
+  .regex(/^$|^-?\d+$/, {
+    message: "Must be empty or contain only digits (optionally prefixed with '-').",
+  });
 
 // Cantidad de dinero (base): solo para la cantidad y la escala, sin moneda
 export const AmountBaseSchema = z.object({