I am deleting an object from a list but it has a one to one (reference) 
with another object, yet it is a nullable field.

Parent  1 ----> * ChildA  
Parent  1 ----> * ChildB  * -----> 0..1 ChildA

I am removing one of ChildA and I am trying to make the reference of ChildB 
to ChildA null (it is nullable), I am getting a `update or delete on table 
"ChildA" violates foreign key constraint`

What is the right way to do it?

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