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How can I implement a field that shows the grand total of a list of objects in a Relation List?

example :

I have a order, and I added products to this order, using relation list ( link products ) , I wanna show to the user a grand total of the products added before finish the order.

It's important to say that the example is just to picture the ideia.

Thanks in advanced


Is there any solutions for this? Simply, making a (product, price) list and can not have price total. A simple example will be very helpful.

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