The information in this article applies to:
When selecting an item I receive this message:
The layer is locked. Items cannot be created or modified on locked layers. Do you want to unlock the layer?
What does this mean?
Every item in Chief Architect is assigned a layer. For example, base cabinets are on the 'Cabinets, Base' layer. When a layer has been locked, it prevents objects on that layer from being selected. New objects cannot be drawn on a locked layer, either. If you lock a layer and then attempt to draw a new object on that layer, a message box will ask you to unlock the layer.
Layers with objects that you need to see as a reference while working, but not select, are good candidates for locking.