To protect model objects from being accidentally modified or deleted, you can lock them. For example, you can lock parts, bolts, welds, and reference models in a Tekla Structures model according to their phase.
When an object is locked, you cannot modify its properties or delete it. You can only change the object’s user-defined attributes that do not affect numbering. If you try to modify or delete a locked object, Tekla Structures displays the following warning message:
"There are locked objects, see report. The operation could not be performed."