I want the graph to show the first condition if the selections of [method] and [parameter] are empty or equal to [method]='M-0010' and [parameter]='M0010', it works:
nothing is selected
parameter=m0010 & method=m-0010
However, in other situations the graph doesn't show if I only select a Parameter without selecting the method, it would be empty if i only select let say parameter=S0030. If I want the second condition to show i have to select both parameter and method.
if I delete line: or (isnull(getfieldselections([method])) and isnull(getfieldselections([parameter]))) in the expression, the graph works correctly, but it doesn't fulfill my requirement.