In Dynamics AX 2012, we can run MRP regarding session date.

[For investigation of mistake in the past]
End users sometimes take mistakes.
They had an experience of lost the order regarding the mistakes.
Obviously, this was a critical issue for them.

For preventing that situation, the root cause analysis is demanded.
Using MRP in the past, they would like to investigate the issue.
If the result of MRP is correct, user missed while confirming, shipping/receiving or invoicing order.
If the result of MRP is incorrect, initial orders were wrong.

For achieving the investigation, they would like to change the execution date of MRP as same as Dynamics AX 2012.

[For future estimation]
At same time, for the future date, the functionality is also useful.
They can create rough plan of keeping resource in future with MRP if it regards session date.