Video for lesson 12 of OpenXava course

This new video will teach you a very useful topic. Many times we need a property whose value will be recalculated automatically in the user interface but also we need it to be persistent, with a column in the database. For this case, you can use an exclusive annotation of OpenXava, @Calculation.
Moreover, you will see how to place some properties of your entities as totals on bottom of any column of a collection. We'll add total properties (sum, vat, total, etc) to our invoices and orders.

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