diff --git a/AMESCoreStudio.WebApi/Models/AMES/Items.cs b/AMESCoreStudio.WebApi/Models/AMES/Items.cs
index 888572c6..6b69e4ce 100644
--- a/AMESCoreStudio.WebApi/Models/AMES/Items.cs
+++ b/AMESCoreStudio.WebApi/Models/AMES/Items.cs
@@ -19,7 +19,7 @@ namespace AMESCoreStudio.WebApi.Models.AMES
         [Column("ITEM_NO")]
         [Required(ErrorMessage = "{0},不能空白")]
         [Display(Name = "組件代碼")]
-        [StringLength(4, ErrorMessage = "{0},不能大于{1}")]
+        [StringLength(25, ErrorMessage = "{0},不能大于{1}")]
         [DataMember]
         public string ItemNo { get; set; }