I'm not sure why it would. Perhaps something in your script before or after is causing it.

What if you run the same command manually on the system?

We have auditing on also and I have not noticed this behavior on our systems.

Is this entry in the local workstation or the server?

Auditing User Right Assignment Changes

You are right, the pkzip command called manually also generates an error. I am unforgettable not to have suspected such this old program.

Thank you again