# Proactive Tracking of Containers at Risk of DEM/DET Charges with OneChain

[Source](https://onechain-tms.com/en/blog/suivi-proactif-des-conteneurs-a-risque-de-frais-de-dem-det-avec-onechain/)

Language: en

Author: OneChain

Updated: 2026-09-17

A container can accumulate charges while a document is missing, a delivery slot is pending or empty return has not been arranged. Start by bringing **shipment events and free-time terms** together.

## Gather the information

For each container, find availability dates, applicable free time, planned collection and the empty-return location. Check provider terms: combined or separate periods, counted days and tariff bands may differ. [Maersk’s detention and demurrage terms](https://terms.maersk.com/dnd) illustrate the distinction; your own contract remains the reference.

## Give the file a next action

[OneChain transport management](https://onechain-tms.com/en/transport-management) brings milestones and partner updates together for coordination. Identify the blocker: documents, customs clearance, road transport, receiving or container return.

Assign the action to the relevant participant and check completion. An ETA alone does not establish a charging deadline; the file’s data and terms must be available.

## Measure the actual result

Track free-time overruns and invoiced charges over comparable periods. Keep the causes and actions taken. An identified risk is not an avoided charge until actual events and applicable terms establish the outcome.