I suggest be beneficial to have the ability to lookup the table and field numbers in the NL function wizard when using a NAV data source. I know that you can just write the numbers in the NL function, but that doesn't give you the table or field name in the finished function.
1 When using the multilanguage layer in NAV it is sometimes not possible to see the correct table and field names in navision. The tables are however always visible.
2 Sometimes tables and fields has the same names in NAV.