diff --git a/mail/icms/tasks.py b/mail/icms/tasks.py
index 971f5609..f5175da2 100644
--- a/mail/icms/tasks.py
+++ b/mail/icms/tasks.py
@@ -21,10 +21,6 @@
 logger = logging.getLogger(__name__)
 
 
-class EdifactFileError(Exception):
-    pass
-
-
 def process_licence_reply_and_usage_emails():
     """Downloads licenceReply and usageData emails from HMRC mailbox and stores in Mail model."""
 
@@ -51,7 +47,6 @@ def process_licence_reply_and_usage_emails():
                 logger.debug("Subject of email being processed: %s", subject)
 
                 if "licenceReply" in subject:
-                    # _check_for_file_errors(mail)
                     _save_licence_reply_email(mail)
                     con.dele(msg_id)
 
@@ -59,10 +54,6 @@ def process_licence_reply_and_usage_emails():
                     _save_usage_data_email(mail)
                     con.dele(msg_id)
 
-                elif "licenceData" in subject:
-                    _check_for_file_errors(mail)
-                    con.dele(msg_id)
-
                 else:
                     raise ValueError(f"Unable to process email with subject: {subject}")
 
@@ -247,11 +238,3 @@ def _save_usage_data_email(usage_email: email.message.EmailMessage) -> None:
     #     extract_type=ExtractTypeEnum.USAGE_DATA
     # )
     raise NotImplementedError
-
-
-def _check_for_file_errors(reply_email: email.message.EmailMessage) -> None:
-    processor = LicenceReplyProcessor.load_from_mail(reply_email)
-    error = None
-    for error in processor._current_rejected.errors:
-        if "Duplicate transaction reference" in error:
-            raise EdifactFileError(f"Unable to process file due to the following error: {error}")
diff --git a/mail/libraries/data_processors.py b/mail/libraries/data_processors.py
index 267db126..234082f1 100644
--- a/mail/libraries/data_processors.py
+++ b/mail/libraries/data_processors.py
@@ -19,6 +19,11 @@
 from mail.libraries.mailbox_service import find_mail_of
 from mail.models import LicenceData, Mail, UsageData
 from mail.serializers import LicenceDataMailSerializer, UpdateResponseSerializer, UsageDataMailSerializer
+from mail.chief.licence_reply import LicenceReplyProcessor
+
+
+class EdifactFileError(Exception):
+    pass
 
 
 def serialize_email_message(dto: EmailMessageDto) -> Mail or None:
@@ -53,6 +58,17 @@ def serialize_email_message(dto: EmailMessageDto) -> Mail or None:
 
     logging.info("Successfully serialized email (subject: %s)", dto.subject)
 
+    processor = LicenceReplyProcessor.load_from_mail(_mail)
+
+    rejected_transaction_errors = processor._current_rejected.errors
+
+    for error in rejected_transaction_errors:
+        if "Duplicate transaction reference" in error.text:
+            run_number = LicenceData.objects.get(mail=_mail).hmrc_run_number
+            raise EdifactFileError(
+                f"Unable to process file due to the following error: {error.text}.  It was sent in run number {run_number}"
+            )
+
     return _mail