When I first came upon the topic of LIS, even though I understood the how of its functionality, the why was still not clear. Created some notes, sharing the notes only here. Additionally have use case examples which I'm not posting yet. But let me know if anyone wants 😊. Please bear in mind I am a fairly new learner too and so if any corrections, please share knowledge. Also these were my personal notes hence a bit rough on aesthetics!
One more use case where LIS can be used is when you need a filter on Line items.
For example: You have Line A, Line item B, Line Item C and Line Item D. Now if there is a requirement that in the dashboard if end user wants to see it dynamically (wants to see only LI A and LI B/ LI C and LI D or any combination) then we can use this module to create LIS and use that as filter by creating filter module where you will have only Show? as line Item dimensioned by LIS.
There has been a mistake on my part, it comes from limitation of my understanding, apologies sincerely. LIS cannot be put in hierarchy. However you can still get the effect as described in the example - Detailed P&L and summary P&L.
Below is screenshot of the module from which I created LIS
Then I created a module dimensioned by the new LIS and added one boolean line item per below
Then I went back to the original module from which I created the LIS and applied a filter per below
You can toggle the filter on and off for detailed or summary P&L.
Apologies again, hopefully this explanation sets it right in your mind too.