It is possible to access that field, but the only way I could figure out a way was to use the Connector Module.

If you have the Connector Module, the Ship Via option is inside the General_Inv table. You can add the General_Inv container in the Connector Module, and then select the ShipViaDesc fields.

Thanks for the info... off to learn about the Connector Module now!

ok, so this is the answer for sure, now I guess I will have to find someone that can help create the correct JOIN sql to get it working. Not sure where to join the fields into the existing container that the original report used (I have recreated that original JOIN in this new container, just not sure how to add these ShipViaDesc fields). Thanks for pointing me in the right direction though!

Well, paid the ransom for a connector license and after a bit of learning I did find the Gen_Inv table you referenced but the field I was looking for was actually in the JrnlHdr table and labeled "ShipVia". What I was after was the actual ship method used for each invoice and this field does the trick. Ended up being simply adding the expression to the container and presto, my problem was solved!