Selection column with check boxes would not appear.

I have a portal report. I have installed "Portal to SAIL" smart service. Now I have data type PortalReportDataSubset. This is just like DataSubset which can be used in a!gridField to display report results. All is well. Now I just want to enable "selection" on the report grid. I have identified the correct value for identifiers field as well. But the selection column with check boxes would not appear. I have no clue what might be wrong here....

SampleGrid.txt

OriginalPostID-116289

OriginalPostID-116289

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