Elgin,

Oh, I see now...

This.name will be re-evaluated each time the datasource is accessed. It may well be the Name of the grid ?

Best is not to have variable in filters

Try this

*SET FILTER TO ALLTRIM(datafield) = ALLTRIM(This.Name)

local f
f = [alltrim(datafield) = '] + ALLTRIM(This.Name) + [']

set filter to &f