Making Purchase Order number field mandatory based on Customer DFF is added on the customer account)

Summary:

Making Purchase Order number field mandatory based on Customer setup(DFF is added on the customer account-PO number required):

We have create DFF : PO number required, and Value is Yes /No, if "Yes" then in Sales order UI Customer Po Number field is mandatory (Required) and Without Enter Customer Po Number Sales order not submitted. If "No" then in Sales order UI Customer Po Number field is non mandatory (non Required) and Without Enter Customer Po Number Sales order is submitted.

How to achieve this requirement.

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