Dependency Assignment in BOM

Hi Every body...

I need your support, I'm trying to use Dependency Assignment into a BOM for a Variant Material, I know how to use this but with a Configurable Material, but, I want use this functionality for some Variants of Material.

I have already my configuration profiles to my Configurable Material, as well I've already the assignment of this Configurable Material to my Variant Material, but.. when I try to insert the Dependency Assignment in the BOM of my Variant, I can get this works.

Any body please, can help me??

This is very important to me.

Thanks in advance

Omar Perea