Hi,
In the activities, these entries display when the affected user reserves something which has the green/red lamp on it (e.g. all kind of attribute dialogs). For example, if you reserve the layer dialog, then you will see the lock entry in the list. So, this kind of lock is NOT a project lock, it is related to the affected attribute.
Regards,
Istvan
István Moharos
Manager, Technical Services
GRAPHISOFT