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Microvia and bbvia DRC support

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First some background. I have an 18 layer board with four sets of microvias and a core bbvia.

L1/L2

L2/L3

L3/L16

L16/L17

L17/L18

Our initial layout had the five sets of vias stacked on top of each other (our vendor preferred this method but had trouble building it). I am tasked with moving the vias apart so none of them are stacked. In essence, I am moving the L2/L3 and L16/L17 vias, therefore unstacking them. I need to turn on a DRC that will flag any stacked vias, as I have thousands on the board.  I have all of the other DRCs working, microvia-microvia, microvia-bbvai, etc (I have the Miniaturization license) but cannot find a DRC that will flag the stacked vias (ex. L1/L2 stacked on top of L2/L3) while not reporting vias that are in the same x/y but have a layer of separation between them. I can have an L1/L2 microvia in the same x/y as the L3/L16 core bbvia location. Please let me know if you need more details.


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