Schedule regeneration will be from &1 forward

What causes this issue?

You have made changes to a recurring obligation that affect the dates
in the schedule. Some schedule lines have already been posted and
therefore may not be changed.

System Response

If you choose to continue, the schedule lines following the last posted
line are regenerated according to the new definition of the schedule.

How to fix this error?

Choose Enter if you wish to proceed with this update. If you do not,
choose Cancel.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.