If fieldvalue exist, then you need to make a selection to show the expression:
As the headline show.
I have salary structures for different countries. For some countries I have several salary structures due to big differences between for example Paris and RegionalFrance.
For some countrys i however have only one structure. Then I just choose the field country = Germany.
So I want to write an expression for the table so that If a value exist for Location (example Paris). Then I need to select Location in the filter also. Otherwise it will just show a message like "You need to select".