XCOMN0293E XCOMPRE FAILED RC=1. Why is this exit running under SYSTEM authority instead of as the User?

Document ID : KB000011182
Last Modified Date : 14/02/2018
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Introduction:

If we try to copy from a remote server in the XCOMPRE exit, we get the following message: XCOMN0293E Preallocation User Exit failed, RC=1. If we do this in the XCOMEND, it works without a problem.

Question:

I am getting this error message from the XCOMPRE exit.  XCOMN0293E XCOMPRE FAILED RC=1. Why is this exit running under SYSTEM authority instead of as the User?

Answer:

All CA XCOM exits for UNIX, Linux and Windows run as the user with the exception of the XCOMPRE and XCOMNTFY exits in the case where they are started by a remotely initiated (incoming) transfer. In this case, both of these exits run as root under Unix or Linux, and SYSTEM for Windows Family.