How to make Product fiscal classification code required in Invoice screen

Summary:

We are using the Product Fiscal Classification Code field as a taxability driver. Currently, this field is not required; however, users must first save the invoice before they can select a Product Fiscal Classification Code. As a result, users may inadvertently miss adding this value, which can lead to incorrect tax calculation.

We are looking to make this field required on the invoice screen and would appreciate any guidance on how to achieve this.

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