Mandatory level check validation doubt

Experts,
In the fusion middle ware pdf it says
Select the Mandatory checkbox if the field is required. The mandatory property is
enforced during entity-level validation at runtime (and not when the attribute
validators are run).
Can some one please explain this to me.
thnks

it will add a database constraint that the value cannot be null
Select if this attribute is mandatory. This option is selected by default if the corresponding database column has a NOT NULL constraint.

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Mandatory level check validation doubt

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