# MSC bills of lading written with both MSCU and MEDU did not track

**URL:** <https://community.dockflow.com/t/msc-bills-of-lading-written-with-both-mscu-and-medu-did-not-track/19>\
**Category:** Known and fixed issues\
**Created:** [November 5, 2026, 8:23pm UTC](https://community.dockflow.com/t/msc-bills-of-lading-written-with-both-mscu-and-medu-did-not-track/19 "2026-11-05T20:23:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dockflow](https://community.dockflow.com/letter_avatar_proxy/v4/letter/d/a9a28c/32.png) [@dockflow](https://community.dockflow.com/u/dockflow)\
**Post date:** [November 5, 2026, 8:23pm UTC](https://community.dockflow.com/t/msc-bills-of-lading-written-with-both-mscu-and-medu-did-not-track/19/1 "2026-11-05T20:23:20Z")

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**Status:** Fixed since August 2026

**How to recognise it**  
An MSC shipment whose bill of lading started with both MSCU and MEDU, one after the other, never received carrier updates.

**Which shipments this affects**  
MSC shipments tracked by a bill of lading that carried both codes in front of the number. Bills with only MEDU in front were not affected, and neither were shipments tracked by container number.

**Cause**  
MSC uses two codes: MSCU as its carrier code and MEDU as the prefix on its bills of lading. MSC does not recognise a reference that carries both.

**What changed**  
When an MSC reference carries both codes, Dockflow now drops the outer one and asks MSC for the standard MEDU form. MSC container numbers that start with MSCU are not changed.

**Is past data corrected?**  
No. The fix applies to new events; earlier events keep their original wording.

**How to check your shipment**  
Look at the bill of lading on the shipment. If it starts with both MSCU and MEDU, carrier events should now appear while the shipment is active. You can look the same bill up on MSC’s own tracking page in its MEDU form. If MSC shows it and Dockflow stays empty, send support the shipment reference.

**Do you need to do anything?**  
Nothing.

**Related**

- [Why is there no tracking data for my shipment? | Dockflow Documentation](https://docs.dockflow.com/faqs/no-tracking-data)
- [Which reference numbers does Dockflow accept? | Dockflow Documentation](https://docs.dockflow.com/faqs/reference-numbers)