saveOrUpdate one to many

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NHibernate

I have one to many- many to one relation between customer and order with cascage="all" on the one to many.

when I update single order in the custoemr and call customer.SaveOrUpdate,
for some reason it creates sql statements that update all the orders.
cant it just update the single order i changed ?

also, why does it update the customer in the db, while none of its fields
was updated ?

Thanks