How many times one module can exist in layer graph

[PavelTurk]

Hello all.

Let's suppose that we have 4 layers:
1) boot
2) layerA (parent - boot)
3) layerB (parent-boot)
4) layerC (parents - layerA, layerB)

Layers A,B,C were created using defineModulesWithOneLoader​(...).

And we have two modules - moduleX and moduleY. ModuleX uses moduleY.
ModuleX is located in layerC.

Do I understand correctly that moduleY can be located in any layer, but only
in ONE layer? I mean, that it is impossible to place moduleY in any TWO layers
at the same time - for example in boot layer and layerB.

I am asking this because I read that it was possible but I tried all variants and
always got ResolutionException: Module ModuleX reads more than one module named
ModuleY.

Best regards, Pavel