update a field on order submitted status

Hello All,

I have a field on form that need to update before order submitted status.

Can anyone suggest me which is the convenient way to achieve this scenario.

I have tried :

1.By registering plugin on SetState and SetStateDynamicEntity message(on PreOperation) - But here field is not updating,even plugin is not fired

2.By registering plugin on update message(on PreOperation) -  everything is working as expected by not sure is it correct way to achieve this requirement.

Thanks