optional fields

How to make a filed of a complex type been optional in a contract?

Hi all

I have some questions about contracts.

I have a complex type and have some field that is optional (a description field), but I put in the contract the complex type.
As it is expected when I make a Submit and I don't fill the optional field I get an error saying this field is expected because it is in the contract.
Is there a way to say to the validator that this field of the complex type is optional?

Thank you very much.
Any assistance would be greatly appreciated.

Kind regards,
Héctor

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