As a newbie to NAV reporting, I always struggled to find the “hidden” field on the report that contains the function to load SetData.
I now found what I think is the easiest, quickest method. Select any field, then tab through all fields on the report. As you do this, you will see the Properties changing. Now, the SetData field is always in red. So if you absentmindedly keep an eye on Font : Color you will quickly see when red appears. Then you know that that is probably the field you are looking for. Click on the Text Box Properties > Visibility > Show or hide based on an expression.
It’s also worth knowing that the field is very often BuyFromAddr or ShipToAddr.