Is it possible to Trigger pop-up message in expense submission page

Summary:

Is it possible to configure a validation pop-up message in Expenses submission page such that if an employee belonging to a business unit applies for expenses under another business unit, a message is triggered on submission saying, ‘You are applying under another business unit. Do you want to continue?’ If the employee selects ‘Yes,’ the expense report should be submitted, and if ‘No,’ the system should allow the employee to correct the business unit and resubmit

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