I think I understand what you are trying to accomplish but not sure. Let me explain how the data is organized and we can go from there. I explained before how the intelligent modules are done. When we talk to the host router and it tells us about the hardware of the intelligent module, that host router isn't aware of the hostname of the intelligent module. It only knows it has the hardware present. When we manage the intelligent module itself, we will know its hostname. SNTC will de-duplicate (by serial number) this hardware since you only have actually one module. It can only associate this hardware to one parent. In your case if it is associated to the router's hostname, then in the custom inventory report you will not see the hostname of the managed SM. I know the relationship to "all" parents isn't currently maintained. But I'll check with development if there is any other way to make the correlation.
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