diff --git a/src/dto/manage-fee/manage-fee-property.dto.ts b/src/dto/manage-fee/manage-fee-property.dto.ts
index 4e085f1..c043c0f 100644
--- a/src/dto/manage-fee/manage-fee-property.dto.ts
+++ b/src/dto/manage-fee/manage-fee-property.dto.ts
@@ -22,7 +22,7 @@ export class FEES_DTO {
 
 export class SPCLCOMMODITY_DTO {
     @ApiProperty({ required: false })
-    @IsString()
+    @IsString({ message: 'Property P_SPCLCOMMODITY must be a string' })
     P_SPCLCOMMODITY: string;
 }