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In classic client NAV 2009 it was very easy to open the form designer -> right click -> properties and then find the "SourceTable" to know exactly where the source (the SQL table) of the data was coming from.
I am trying to find a way to do this in NAV2017. Is it possible? What is shown in the address bar of the application isn't necessarily the actual SQL table name.
Click CTRL+ALT+F1 or Page Information menù in the top left corner of every NAV Page. Here you can see the table and the record details.
If CTRL+ALT+F1 doesn't work then please add Windows Key to in this, it will work.