Query to display only the last invoice for each ShipToCode from the OINV table

Good day all

I need to write a query that pulls ONLY the last invoice for each ShipToCode from each CardCode using the OINV table.

Any ideas on a query that I can write to do this.I have written something like this but get the aggregate function error for a few fields in the select statement. Please help on making this work

Select

          DocNum,         

          CardCode,

          ShipToCode,

           DocDate

From

          OINV

WHERE

          CardCode = [%0]

ORDER BY

          DocDate DESC

Group by

          ShipToCode

Many thanks and Regards

Nevashan