diff --git a/api/src/gateway/schemas/sms.schema.ts b/api/src/gateway/schemas/sms.schema.ts
index c78caa5..2600f4e 100644
--- a/api/src/gateway/schemas/sms.schema.ts
+++ b/api/src/gateway/schemas/sms.schema.ts
@@ -12,7 +12,7 @@ export class SMS {
   @Prop({ type: Types.ObjectId, ref: Device.name, required: true })
   device: Device
 
-  @Prop({ type: Types.ObjectId, ref: SMSBatch.name, required: true })
+  @Prop({ type: Types.ObjectId, ref: SMSBatch.name })
   smsBatch: SMSBatch
 
   @Prop({ type: String })