In Microsoft Dynamics, Marketing Lists have the ability to be locked or unlocked by changing the value of the Locked field.
Members cannot be added to or removed from a locked Marketing List. There are certainly times when it is appropriate to lock a Marketing List, but doing so may interfere with various Click functions, such as adding members to a Marketing List using a form action or Campaign Automation action. Locking a Marketing List can also cause the Click Import tool to return an error if you attempt to use the Import tool to update a Marketing List.
You can toggle a Marketing List between locked and unlocked by changing the value of the Locked field.
NOTE: If you are not the owner of the locked marketing list, be sure to consult the owner before unlocking it.
NOTE: When creating a static copy of a dynamic marketing list, Dynamics will automatically set the static list to locked.