Hi Sharvari Joshi,
I think the SAP help for this configuration is quite clear, the "Detail display" option is a reporting feature:
- if you activate this option for a particular scale, items (appropriation requests or measures) with that scale will show in reporting even when you are running a summarized report.
- if the option is not active, summarized reports will not show the items (only summarized values for all items selected).
Regards.