Fixed qty on assemblies

So I was experimenting with fixed quantities and would like to use it with an assembly. However, when I do, the system doesn't seem to use the flag for assemblies. Only for materials.

I notice that once I pull it into a job, there is no fixed qty flag for the assemblies, only for the materials. Is my assumption correct that the system ignores this flag for parts set up as assemblies?

I'm using E-10.0.700.4