It is not working in that order, should the API return an array if this handle is used in multiple assemblies, or think about that the model is assembled twice, in the same level. You have to visit an assembly by components, you mmay have to write a special filter. But you need to save the structure (asm > prt‘s asm‘) in memory, or do this over an over. If you get the feature parent(s) from the component feature, you may get the parent component, but I never tried that 😉 because you may not always find a parent assembly.
