Origin and basis of the concept
Article 156 of Spain’s General Social Security Act defines an occupational accident. The expression “en misión” has developed through case law on that basis to analyse certain journeys and activities undertaken for work purposes.
It is not a label that can be applied simply because a hotel booking or travel instruction exists. The specific activity, time of injury and relationship with the assignment matter. This article concerns the Spanish framework; other countries use different categories and rules.
Difference from an in itinere accident
An in itinere accident relates to travel to or from home and work, subject to the applicable requirements. In a work-assignment accident, the travel arises from the assignment itself or from performing work duties away from the usual workplace.
A journey between two clients during sales visits presents a different situation from the ordinary journey home. Nor is an assignment accident limited to road accidents: an injury may occur while carrying out the assigned activity elsewhere. The label should follow the facts, not replace their analysis.
Rest periods and personal activities
The presumption of work-relatedness in Article 156(3) does not simply extend to every hour of a trip. The legal analysis published by BOE of Supreme Court judgment 278/2023 highlights the need to assess the circumstances and connection with work.
Staying away from home for professional reasons does not make every injury work-related. Equally, it should not be concluded that all rest periods or activities associated with travel are always excluded. The answer depends on the established circumstances and applicable legal criteria.
What information should be retained
Record the assignment, agenda, route, location, time, activity performed and circumstances of the event. Add treatment records, witness accounts and relevant documentation while respecting confidentiality. Distinguish verified facts from hypotheses.
Do not alter descriptions to fit the case into a category. Preventive investigation and determination of the social security contingency serve different purposes. If classification is disputed, the appropriate procedure before the competent bodies must be used; an internal classification does not, by itself, settle the issue.
Prevent and investigate even when the legal position is uncertain
Preventive planning should consider travel, work at other organisations’ premises, schedules and access to assistance. When harm occurs, identify which conditions can be improved: routes, workloads, coordination or available information.
Do not wait for a final decision before correcting a known hazardous condition. Spain’s Occupational Risk Prevention Act connects investigation of harm with identifying preventive causes. That review does not require anticipating a legal ruling or attributing blame to the affected person.
Hypothetical example: a technical visit away from the workplace
A technician travels on an assignment to inspect equipment and falls while accessing the client’s intervention area. The task, location, instructions and access conditions are documented.
This information supports analysis of the work connection and review of preventive coordination. If another injury occurred during a private activity while staying away, the same conclusion would not automatically apply. Each situation requires examination of its facts and the applicable framework.
