While executing a
Process Builder, I am receiving the following error:
Error Occurred: UPDATE --- UPDATE FAILED --- ERRORS : (INSUFFICIENT_ACCESS_OR_READONLY) You can not update fields except RTime and Itime on a child event.
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This is a permission error it would seem...
Process Builder runs as the RUNNING USER. If you want to do it via Process Builder then you need to modify your system's permissions.
If you need to bypass that and run as system, you can do that in a Flow triggered by a Process Builder.