How to create a custom alert when creating a new order on Dynamics NAV 2013r2

Hello everyone,

As it is asked in the title, we are a winery in France and would like to create custom alerts for several customers, that would appear when creating a new order.

This popup would show several important information to remember. 

For example we have a customer that pays 2/3 of all its invoices in one time for the whole next year but sadly the Deposit function doesn't work for us so sometimes we forget that 2/3 has already been paid and send a false invoice.

Thank you for your help, wishing everyone a nice day !

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