how can we mandate project details at invoice lines

Summary:

When the user is entering Project details, funding source and contract number is not a mandatory field at line but it is mandatory at distributions. Users are saving without entering those details and invoices are going into error and holds. Later the user is correcting and entering it but it will not be copied to the distributions ofcourse.

Is there a way when user enter project details specifically, we can mandate those details?

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