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I create Document InvoiceExchange, create DocumentForm. See screenshot 5.1. Amount in InvoiceExchange
Field Sales Invoice in Page Invoice List Detail get data from DocumentRef.SalesOrder. See screenshot 5.2. Amount in InvoiceExchange
When get data in Field Sales Invoice in Page In Invoice List Detail, I want field Amount in Page In Invoice List Detail auto-filled taken from DocumentAmount from that SalesOrder. See screenshot 5.3. Amount in InvoiceExchange
How to do that?

Hello Gigha!

you should use the "On Change" event. Please look at the screenshots. Also for your convenience I have attached dt file with a small example.

Thank you, it works