Shows the hierarchical level of an assembly. The possible values are:
0 : The assembly is on the highest level of the hierarchy.
1 : The assembly is on the highest level in a nested assemblyassembly that consists of several assemblies on many assembly levels
Nested assemblies include elements that are manufactured as sub-assemblies.
2 : The assembly does not have any nested assemblies within it.
Any other number: The assembly is a nested assembly within an another assembly. The number defines the level of the assembly in the assembly hierarchyarrangement of assemblies that describes the manufacture and erecting of the actual assembly to be built