# GDPR Recital 138

General Data Protection Regulation (GDPR), version 2026.1, in force since 25 May 2018. Read from https://publications.europa.eu/resource/celex/32016R0679. Each clause starts with its key, which is how to cite it.

## gdpr-recitals:rec-138

The application of such mechanism should be a condition for the lawfulness of a measure intended to produce legal effects by a supervisory authority in those cases where its application is mandatory. In other cases of cross-border relevance, the cooperation mechanism between the lead supervisory authority and supervisory authorities concerned should be applied and mutual assistance and joint operations might be carried out between the supervisory authorities concerned on a bilateral or multilateral basis without triggering the consistency mechanism.

Page: https://dpolens.com/laws/gdpr/rec-138