Schedule records still exist for MRU &1 of dynamic scheduling

What causes this issue?

You are processing a meter reading unit from dynamic scheduling. You can
only process dynamic schedules with the transactions <LS>Delete and
Create Dynamic Schedule Records</> (E1DY) and <LS>Change/Display Dynamic
Schedule Records</> (E2DY).

System Response

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

How to fix this error?

After you have changed the meter reading unit, you must use the
transaction E1DY to generate new schedule records for the modified meter
reading unit and the corresponding dynamic period. At the same time, the
existing schedule records are deleted.
You can only use transaction E1DY to delete the schedule records of a
meter reading unit if the schedule records (selected via the dynamic
period) do not have any meter reading orders. Delete any meter reading
orders before you start this process.

Error message extract from SAP system. Copyright SAP SE.