Here is a Data Dictionary with Tables and Fields. Also, you could utilize a Rapid Start package that exports the Table and fields to Excel.
3000.NAV036 - Data Dictionary.xlsx
Hope this helps.
I could write a very long reply here... A lot of the Item, Customer, and Vendor Cards have required and fields that are based on the company you are setting up. I am attaching the NAV 2009 manuals on Customer, Vendor and Item.
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