The purpose of the linked document below is to inform MAHs and end-users of the functionality to mark packs as locked in EMVS. There are no legal requirements to use the functionality and hence usage of the functionality is voluntary.
The functionality to mark a pack as locked is not described as a legal requirement in the delegated regulation (EU) 2016/161. For this reason, there are no legal requirements for any supply chain actor to mark a pack as locked.
However, the functionality can provide added value and security in preventing medicines in quarantine or under investigation entering in or going back into the supply chain.