What is the right amount of Detail

Summary:

Have a customer who wants to view few of the Payables data at invoice Level in EPM.

We suggested to load the detailed information in Data Management and load summary Level data in EPM, so they can drill back and view the details. Catch with this method is how long this staging area data will be present for them to look back?

The question here is, have we had customers who had loaded invoice Level data in a Aggregate Storage Cube, if its limited? Has anyone come across such request and if yes, how was that managed.

Kindly post your views