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The "Vitreous_China-White-0" is an out of the box lavatory. I was able to attache it ONCE to a countertop. Every other attempt failed. So, I copied the countertop with lavatory to other places. Also, the lavatory is showing up red. Why is this happening? Why is it difficult to attach a lavatory to a countertop?
When executing the procedure (adding the lavatory to a countertop) the following message occurs: "Cant cut instance(s) of Vitreous_China-White-0 out of its host.
Could be the Family has a Nested Void inside it which cuts the countertop?
Try using Cut Geometry.
Also check if the Family has "Cuts with Voids When Loaded" enabled.