Let me explain you by example, 

I have product "Subscription" I wanted to create two variant of it.

1. Yearly

2. Monthly

so I create attribute_ids in the product template like 

type -> yearly, monthly

when I save the record it creates two variant product with month UOM by default.

Now if I change the UOM of one of the variant to year it changes all UOM of another variant also because of the nature of _inherits.

How can I over come this situation?