IBM i: Error when starting a remote instance

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Symptom
If you want to stop a remote instance from the central instance host, the command STOPSAP has no effect.
Other terms
AS/400, OS400, system i, i5/OS, iSeries
Reason and Prerequisites
This problem is caused by a programming error.
Solution
The following patches with at least the specified patch level correct the problem (the specification nn will soon be defined):
SAP Release 640: [...]