Error while using Export Data Store Entity To Excel : Either selection or filters are invalid: The field [XYZ] does not exist. (APNX-1-4505-009)

I am using Export Data Store Entity To Excel smart service to export the data from a table to excel file.

When I export everything from the table it works well, however when I use Selection

= a!querySelection(
  columns: {
    a!queryColumn(
      field: pv!exportData.TechSpec,
      alias: "Tech_Spec"
    ),
    a!queryColumn(
      field: pv!exportData.Preservation_Demand,
      alias: "Preservation_Demand"
    )
  }
)

I get this error below :

Please help me with it.