Commenting on dynamic version selection

Hi Experts,

I have a requirement where user would like to select 2 versions - Current Forecast & Previous Forecast. After selection there needs to be a delta calculation and the last column would be the Comment column.

When i am trying to achieve this using Restricted Measure (Cross calculations) then i am unable to comment as it says calculated measure.

Another option is providing date and version in columns and on the fly story calculation for Delta and provide one column for comment but in this case as soon as the version is changed, the delta calculations gets vanished.

Is there any other way this functionality can be achieved.

Thanks & Regards,

Pranav Vyas