This is a notification that amortization data may only be available for the specified date forward.  No action is needed.

For example, there may be an alert that shows the following:

"Due to insufficient Cost and Usage Report history in the given analysis period, amortization is only present from the listed date forward for the following accounts: CONSOLIDATED BILLING ACCOUNT 07/02/2020."

This means that data for the "CONSOLIDATED BILLING ACCOUNT" account will not be showing prior to 7/2/2020.  It's simply a notification explaining why that particular account may appear differently in the amortization report prior to the date shown.